COPELAND, Justice.
This appeal presents two issues for consideration:. (1) May the Commission through its ratemaking and supervisory authority include in Southern Bell’s operating expenses and revenues for ratemaking purposes those expenses, revenues and investments relating to its directory advertising operations (commonly referred to as the Yellow Pages)? We conclude that the Commission may include those expenses, revenues and investments, arising from directory advertising, in ratemaking proceedings. (2) Was the Court of Appeals incorrect in treating as moot Southern Bell’s [544]*544claim that the Commission’s determination granting a 13.5% rate of return on common equity is arbitrary, unreasonable and confiscatory in violation of our State and Federal Constitutions? Although the Court of Appeals was incorrect in determining that the fair rate of return issue was moot, the established rate of return on equity of 13.5% is not in violation of either the State or Federal Constitutions.
The first issue raised by the appellant, Southern Bell, concerns whether the Commission has the authority to include, in the Company’s operating statistics for the purpose of ratemaking, the investments, the costs and the revenues relating to Southern Bell’s directory advertising operation. Southern Bell vigorously argues that the Commission does not possess the necessary authority to include within the rate base the expenses and revenues from its directory advertising operation because that operation is not an essential part of the public utility function of providing telecommunications service. In support of this position Southern Bell points out that the actual transmission of messages across telephone lines does not rely on the yellow pages being available. Although Southern Bell is technically correct in its contention that actual transmission of messages across telephone lines is not dependent on the existence of the yellow pages, such an interpretation of the public utility function is far too narrow. Southern Bell’s utility function is to provide adequate service to its subscribers. To suggest that the mere transmission of messages across telephone lines is adequate telephone service is ludicrous.
We wish to point out that the yellow pages have never been and are not now regulated by the Utilities Commission. However, the fact that a specific activity of a utility is not regulated does not mean that the expenses and revenues from that activity cannot be included in determining the rate structure of the utility. In fact, the revenues and expenses from directory advertisements have historically been included in ratemaking determinations in this state.
The Supreme Court of New Mexico was recently faced with this very issue and concluded that the “revenues, expenses and investments related to directory advertising” should be included in rate determinations. Mountain States Telephone and Telegraph [545]*545Company v. Corporation Commission, 653 P. 2d 501, 506 (N.M. 1982). In addition to New Mexico, thirty states plus the District of Columbia include directory advertising revenues in ratemaking proceedings. 127 Cong. Rec. S11139-40 (Daily Ed. October 6, 1981).
It is true, as Southern Bell points out, that the Utilities Commission possesses only those powers granted it by the legislature. State ex rel Utilities Commission v. General Telephone Co., 281 N.C. 318, 189 S.E. 2d 705 (1972). Through G.S. 62-30 and G.S. 62-32 the legislature has granted the Commission “such general power and authority to supervise and control public utilities of the State as may be necessary. . . .” G.S. 62-30. “The Commission is hereby vested with all power necessary to require and compel any public utility to provide and furnish . . . reasonable service of the kind it undertakes to furnish and fix and regulate the reasonable rates and charges to be made for such service.” G.S. 62-32(b).
Although G.S. 62-30 and G.S. 62-32 appear to provide the Commission with ample authority to include directory advertising in ratemaking proceedings, Southern Bell argues that G.S. 62-3(23)d limits that authority by providing: “If any person conducting a public utility shall also conduct any enterprise not a public utility, such enterprise is not subject to the provisions of this Chapter.” § 62-3(23)d. In response to this contention we simply point out that the directory advertising operation of Southern Bell is not a separate enterprise from the transmission of telephone messages. The yellow pages are a very useful and beneficial component in providing telephone service to the public. In fact as Southern Bell points out on Page 137 in its February 1982, Raleigh, North Carolina Yellow Pages, “4 out of 5 [adults] Look in the Book.” On page 265 of that same book we find that every year the yellow pages are referred to “a total of almost 3.69 billion times.” Indeed, the yellow pages are more than a convenience to newcomers in town who need a doctor, lawyer, plumber, electrician or any number of services. Newcomers could not be expected to begin in the front of the alphabetical listings and search until they find the desired service. In fact Southern Bell uses that very situation to promote the sales of its advertisements, “Let newcomers get acquainted with you — Include all of your lines in these Yellow Pages.” P. 202 of 1982 Raleigh, North Carolina Yellow Pages.
[546]*546Southern Bell contends that since the yellow pages were not available in all of its exchanges until 1955, it must not be essential to adequate telephone service. However, the Commission, in discussing the evidence presented relating to this question, stated “The classified directory in which advertising appears, is an integral part of providing adequate telephone service.” “On the Appeal to the Superior Court the Commission’s findings of fact are conclusive and binding if they are supported by competent, material, and substantial evidence in view of the entire record.” State ex rel Utilities Commission v. Champion Papers, Inc., 259 N.C. 449, 454, 130 S.E. 2d 890, 894 (1963). There was ample evidence before the Commission to support the inclusion of the expenses and revenues from directory advertising in the ratemaking process.
Southern Bell further argues that inclusion of revenues and expenses from directory advertising is unfair in light of the competition it faces from newspapers, magazines, pamphlets and other classified directories. The Commission answered this contention by stating, “competitive pressures may eventually be a factor in the marketing of directory advertising by Southern Bell . . . however, based on the evidence presented there is presently no substantial competition posing a threat to Southern Bell’s advertising market in North Carolina.” We agree there is no real competition. In its areas of service Southern Bell commands an unmatchable position by being able to guarantee that every subscriber of telephone service will receive the advertisement since the Company is required to provide an alphabetical listing (white pages) to all of its telephone subscribers. In addition, unlike any competitor, Southern Bell is able to place those advertisements with or within the same book in which the required alphabetical listing is carried.
The result is clear. Southern Bell enjoys a great advantage over all competitors in the field of directory advertising. In addition, this preferred position with all its benefits and revenues is directly related to and a result of the Company’s public utility function.
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COPELAND, Justice.
This appeal presents two issues for consideration:. (1) May the Commission through its ratemaking and supervisory authority include in Southern Bell’s operating expenses and revenues for ratemaking purposes those expenses, revenues and investments relating to its directory advertising operations (commonly referred to as the Yellow Pages)? We conclude that the Commission may include those expenses, revenues and investments, arising from directory advertising, in ratemaking proceedings. (2) Was the Court of Appeals incorrect in treating as moot Southern Bell’s [544]*544claim that the Commission’s determination granting a 13.5% rate of return on common equity is arbitrary, unreasonable and confiscatory in violation of our State and Federal Constitutions? Although the Court of Appeals was incorrect in determining that the fair rate of return issue was moot, the established rate of return on equity of 13.5% is not in violation of either the State or Federal Constitutions.
The first issue raised by the appellant, Southern Bell, concerns whether the Commission has the authority to include, in the Company’s operating statistics for the purpose of ratemaking, the investments, the costs and the revenues relating to Southern Bell’s directory advertising operation. Southern Bell vigorously argues that the Commission does not possess the necessary authority to include within the rate base the expenses and revenues from its directory advertising operation because that operation is not an essential part of the public utility function of providing telecommunications service. In support of this position Southern Bell points out that the actual transmission of messages across telephone lines does not rely on the yellow pages being available. Although Southern Bell is technically correct in its contention that actual transmission of messages across telephone lines is not dependent on the existence of the yellow pages, such an interpretation of the public utility function is far too narrow. Southern Bell’s utility function is to provide adequate service to its subscribers. To suggest that the mere transmission of messages across telephone lines is adequate telephone service is ludicrous.
We wish to point out that the yellow pages have never been and are not now regulated by the Utilities Commission. However, the fact that a specific activity of a utility is not regulated does not mean that the expenses and revenues from that activity cannot be included in determining the rate structure of the utility. In fact, the revenues and expenses from directory advertisements have historically been included in ratemaking determinations in this state.
The Supreme Court of New Mexico was recently faced with this very issue and concluded that the “revenues, expenses and investments related to directory advertising” should be included in rate determinations. Mountain States Telephone and Telegraph [545]*545Company v. Corporation Commission, 653 P. 2d 501, 506 (N.M. 1982). In addition to New Mexico, thirty states plus the District of Columbia include directory advertising revenues in ratemaking proceedings. 127 Cong. Rec. S11139-40 (Daily Ed. October 6, 1981).
It is true, as Southern Bell points out, that the Utilities Commission possesses only those powers granted it by the legislature. State ex rel Utilities Commission v. General Telephone Co., 281 N.C. 318, 189 S.E. 2d 705 (1972). Through G.S. 62-30 and G.S. 62-32 the legislature has granted the Commission “such general power and authority to supervise and control public utilities of the State as may be necessary. . . .” G.S. 62-30. “The Commission is hereby vested with all power necessary to require and compel any public utility to provide and furnish . . . reasonable service of the kind it undertakes to furnish and fix and regulate the reasonable rates and charges to be made for such service.” G.S. 62-32(b).
Although G.S. 62-30 and G.S. 62-32 appear to provide the Commission with ample authority to include directory advertising in ratemaking proceedings, Southern Bell argues that G.S. 62-3(23)d limits that authority by providing: “If any person conducting a public utility shall also conduct any enterprise not a public utility, such enterprise is not subject to the provisions of this Chapter.” § 62-3(23)d. In response to this contention we simply point out that the directory advertising operation of Southern Bell is not a separate enterprise from the transmission of telephone messages. The yellow pages are a very useful and beneficial component in providing telephone service to the public. In fact as Southern Bell points out on Page 137 in its February 1982, Raleigh, North Carolina Yellow Pages, “4 out of 5 [adults] Look in the Book.” On page 265 of that same book we find that every year the yellow pages are referred to “a total of almost 3.69 billion times.” Indeed, the yellow pages are more than a convenience to newcomers in town who need a doctor, lawyer, plumber, electrician or any number of services. Newcomers could not be expected to begin in the front of the alphabetical listings and search until they find the desired service. In fact Southern Bell uses that very situation to promote the sales of its advertisements, “Let newcomers get acquainted with you — Include all of your lines in these Yellow Pages.” P. 202 of 1982 Raleigh, North Carolina Yellow Pages.
[546]*546Southern Bell contends that since the yellow pages were not available in all of its exchanges until 1955, it must not be essential to adequate telephone service. However, the Commission, in discussing the evidence presented relating to this question, stated “The classified directory in which advertising appears, is an integral part of providing adequate telephone service.” “On the Appeal to the Superior Court the Commission’s findings of fact are conclusive and binding if they are supported by competent, material, and substantial evidence in view of the entire record.” State ex rel Utilities Commission v. Champion Papers, Inc., 259 N.C. 449, 454, 130 S.E. 2d 890, 894 (1963). There was ample evidence before the Commission to support the inclusion of the expenses and revenues from directory advertising in the ratemaking process.
Southern Bell further argues that inclusion of revenues and expenses from directory advertising is unfair in light of the competition it faces from newspapers, magazines, pamphlets and other classified directories. The Commission answered this contention by stating, “competitive pressures may eventually be a factor in the marketing of directory advertising by Southern Bell . . . however, based on the evidence presented there is presently no substantial competition posing a threat to Southern Bell’s advertising market in North Carolina.” We agree there is no real competition. In its areas of service Southern Bell commands an unmatchable position by being able to guarantee that every subscriber of telephone service will receive the advertisement since the Company is required to provide an alphabetical listing (white pages) to all of its telephone subscribers. In addition, unlike any competitor, Southern Bell is able to place those advertisements with or within the same book in which the required alphabetical listing is carried.
The result is clear. Southern Bell enjoys a great advantage over all competitors in the field of directory advertising. In addition, this preferred position with all its benefits and revenues is directly related to and a result of the Company’s public utility function. For these reasons we agree with the Utilities Commission and the Court of Appeals that the Commission does have the authority to include the expenses, revenues and investments related to directory advertising in its ratemaking proceedings.
[547]*547Southern Bell argues that allowing the Commission the authority to include the expenses and revenues related to directory advertising in ratemaking proceedings is contrary to our holding in Gas House, Inc. v. Southern Bell Telephone Co., 289 N.C. 175, 221 S.E. 2d 499 (1976). In Gas House this Court held that, “The business of carrying advertisements in the yellow pages of its directory is not part of a telephone company’s public utility business.” 289 N.C. at 184, 221 S.E. 2d at 505. The Gas House case concerned the validity of an exculpatory clause in a contract for the publication of an advertisement within the yellow pages. Although the above language is no more than obiter dictum, it is not inconsistent with the result we reach today. To the extent that the language in Gas House is inconsistent with our holding in the case sub judice that language is overruled. This language does not go so far as to say that the furnishing of a classified listing of subscribers, like that found in the yellow pages, to its customers is not an integral part of the public utility’s function of providing adequate telephone service to the citizens of North Carolina. In fact, that is exactly what the Commission found in finding of fact number nine. We therefore uphold the inclusion of the expenses, revenues and investments related to directory advertising in the ratemaking process. We also note that under G.S. 62-42(5) the Commission has the authority to order the utility to take action necessary to secure reasonably adequate service for the public’s need and convenience. Undoubtedly yellow pages could fall within this provision.
The second issue raised by Southern Bell is whether it was incorrect for the Court of Appeals to hold that its claim that a 13.5% rate of return on common equity is confiscatory in violation of our State and Federal Constitutions was moot by virtue of a later rate increase. The Court of Appeals, in our view, was mistaken and the question of whether 13.5% is a confiscatory rate of return on common equity is not moot.
In its opinion the Court of Appeals relied on Utilities Commission v. Southern Bell Telephone Company, 289 N.C. 286, 221 S.E. 2d 322 (1976), in holding that the issue concerning a fair rate of return on common equity becomes moot by a subsequent rate increase. We believe that the Court of Appeals has misconstrued the meaning of Utilities Commission v. Southern Bell Telephone Company, supra, as it applies to this case. The primary error in [548]*548rendering Southern Bell’s claim moot is that the question to be considered in this case arises out of a general ratemaking case, docket number P-55 Sub 784, while the subsequent rate hike in March of 1982, almost a year after the Commission’s order was filed in the original case, is from docket number P-55 Sub 794 which relates to a different time frame. The later rate increase does not cover entirely that period of time covered by the original general rate case. This must be true since rates are set prospectively and not retroactively. Therefore, the original rate case must be fully and finally decided by the courts. Under these circumstances the issue in the case sub judice of whether a 13.5% rate of return on common equity is a fair rate of return must be considered.
Before determining the question of whether 13.5% is a confiscatory rate of return under our Federal and State Constitutions we emphasize that it is the Commission, not the Courts, which is authorized by the legislature to determine what is a fair rate of return. Utilities Commission v. Duke Power Company, 285 N.C. 377, 206 S.E. 2d 269 (1974); Utilities Commission v. Va. Electric and Power Co., 285 N.C. 398, 206 S.E. 2d 283 (1974). Therefore, we cannot and will not substitute our judgment of what is a fair rate of return for the judgment of the Commission. Utilities Commission v. Duke Power Co., 305 N.C. 1, 287 S.E. 2d 786 (1982). “Rates fixed by the Commission are deemed prima facie just and reasonable.” Utilities Commission v. Duke Power Co., 305 N.C. 1, 10, 287 S.E. 2d 786, 792 (1982). See also G.S. 62-94(e). As a result, in reviewing the Commission’s determination of a fair rate of return, this Court will only review the record and the evidence to determine if the Commission’s order is supported by competent evidence.
The Commission heard testimony from five distinguished experts concerning a proper rate of return on common equity for Southern Bell. This testimony was recapitulated by the Commission in its “Evidence and Conclusions For Finding of Fact No. 10” beginning on Page 586 and continuing through Page 592 of the record. Within these pages, among other things, the Commission set out the final recommendations of four of the five experts who employed the “discounted cash flow” analysis for determining proper rate of return. The results as set out in the record are:
[549]*549
Witness Final Recommendation
Carleton 16.0 - 16.5%
Langsam 13.5 - 14.0%
Vander Weide 16.0 (17.5%)
Watson 13.5%
As can be seen from this chart, the Commission’s final determination of 13.5% is the exact rate recommended by witness Watson and is within the range of recommendation of witness Langsam. The other two witnesses, Carleton and Vander Weide testified on behalf of Southern Bell. Perhaps one reason for their significantly higher recommendations, other than their ties to Southern Bell, is that each one treated Southern Bell as an industry that is as risky an investment as any other industry. The Commission within its conclusions stated that it could not accept the argument that a company like Southern Bell is as risky an investment as those industries which are subject to the pressures of competition.
As we stated most recently in an opinion written by Justice Meyer:
It is well settled that the credibility of witnesses and the probative value of particular testimony are for the administrative body to determine, and it may accept or reject in whole or in part the testimony of any witness. While an administrative body must consider all of the evidence and may not disregard credible undisputed evidence, it is not required to accept particular testimony as true.
State ex rel Utilities Commission v. Duke Power Co., 305 N.C. 1, 21, 287 S.E. 2d 786, 798 (1982). It is clear from the record that the Commission weighed all the evidence presented before reaching a conclusion. It is also clear that the Commission gave greater weight to the testimony of the witnesses not associated with Southern Bell. However, as Justice Meyer wrote:
An expert’s opinion testimony may be given less credibility and therefore minimum consideration when the expert is friendly or sympathetic to the party on whose behalf he is testifying. The opinion of the expert may simply be intrinsically non persuasive even though it is uncontradicted.
[550]*550State ex rel. Utilities Commission v. Duke Power Co., 305 N.C. 1, 23, 287 S.E. 2d 786, 799. If the Commission may refuse to accept the uncontradicted evidence presented to it by a utility, it most certainly may reject the utility’s evidence in favor of evidence presented by other witnesses. That is exactly the circumstance in this case.
Such an action by the Commission is even more understandable in light of the fact that, unlike the utility, the Commission must balance the needs and interests of the utility with the needs and interests of the public. G.S. 62433(b)(4).
Considering the evidence presented to the Commission, the fact that two witnesses recommended a rate of return consistent with 13.5% and the fact that the Commission must strike a balance between the needs of the utility and the needs of the public, we must conclude that the Commission’s determination that a 13.5% rate of return on common equity is a fair rate of return, is not arbitrary and capricious and is not confiscatory in violation of Article I, Section 19 of the North Carolina Constitution or the United States Constitution.
We therefore hold that the action taken by the Commission is not arbitrary and is sufficiently supported by the evidence. The opinion of the Court of Appeals is modified in part and affirmed.
Modified and affirmed.
Justices MARTIN and Frye did not participate in the consideration or decision of this case.