Justice MULLARKEY
delivered the Opinion of the Court.
We granted certiorari in this case to decide whether a holder in due course of a promissory note, signed in the name of the principal by his agent who held a general power of attorney, could sue upon the note and enforce it against the principal. For the reasons stated below, we answer that question in the affirmative. Accordingly, we reverse the judgment of the court of appeals in Willey v. Mayer, 862 P.2d 959 (Colo.App.1993), and remand the ease to that court to resolve the undecided issues on appeal and for further proceedings consistent with this opinion.
I
In June 1982, Raymond C. Mayer (Mayer), president and director of Western Slope Investment & Development, Inc. (Western Slope), granted a general power of attorney to R. Martin Rhodes, II (Rhodes), an officer and attorney for Western Slope. The power of attorney, which by its terms was to remain in force until revoked by written instrument, authorized Rhodes to “buy, sell and deal in real and personal property of any description; to sign deeds, contracts and bills of sale; to borrow money and to grant any type of security interest in any of our real or personal property to secure loans; and to accept payment in his own name for any property sold, or payment of any money borrowed in my name.” 1 Between 1984 and 1989, Rhodes used this power of attorney to sign various corporate documents in the name of Mayer and Western Slope. In fact, Mayer had Rhodes sign documents for him in transactions involving Western Slope which were executed while Mayer was in prison in North Dakota in 1984 and 1985, including a $2 million loan agreement and a $3 million purchase option agreement.
In October 1988, without the knowledge of Mayer and while the power of attorney was still in effect,2 Rhodes signed Mayer’s name as president of Western Slope on a promissory note made payable to Rhodes by Western Slope in the amount of $40,000. Rhodes thereafter borrowed $10,000 from petitioner Clarence E. Willey (Willey) in exchange for a $15,000 promissory note payable by Rhodes to Willey. The $15,000 note to Willey was secured by an assignment of the $40,000 Western Slope promissory note, which in turn was secured by a deed of trust on property owned by Western Slope. Rhodes had also signed Mayer’s name as president of Western Slope on the deed of trust.3
After paying Willey $5,000, Rhodes defaulted on the $15,000 promissory note. Wil-ley then demanded payment from Western Slope and Mayer on the $40,000 note which Rhodes had indorsed to Willey to secure the loan. When they refused to pay the $40,000, Willey commenced this action to enforce the promissory note. Following a bench trial, the trial court entered judgment on the note in favor of Willey in the amount of $5,0004 plus interest and $5,000 in attorney fees.
In its order, the trial court found that although the power of attorney was in force [1263]*1263and effect at the time Rhodes entered the loan agreement with Willey, Mayer had not authorized Rhodes to sign his name to the $40,000 note. It found, however, that Western Slope and Mayer were precluded under section 4-3-406, 2 C.R.S. (1992), of the Colorado Uniform Commercial Code (UCC), from asserting Rhodes’ lack of authority to sign Mayer’s name to the note because Mayer’s failure to terminate the power of attorney upon Mayer’s return from prison constituted “negligence substantially contributing to the making of the note.” It further found that Willey was a holder in due course of the $40,000 note and that Willey took the note free of any fraud defense asserted by Western Slope and Mayer. Finally, the trial court found that Western Slope was the alter ego of Mayer and that Mayer thus was personally liable to Willey on the note.
The court of appeals reversed,5 holding that Western Slope and Mayer were not precluded from asserting Rhodes’ lack of authority to sign the note on Mayer’s behalf because Willey’s acceptance of the note from Rhodes “was not causally related to the negligence of Mayer in not timely revoking the power of attorney.”6 Willey, 862 P.2d at 962. The court of appeals also noted an “apparent contradiction” between the trial court’s findings that Rhodes simultaneously was authorized to affix the signature of Mayer, his principal, to the note by virtue of the power of attorney, yet not authorized by Mayer to sign the note because “Mayer had not ratified the signature.”7 Id. at 960. The court of appeals concluded, however, that Rhodes’ signature was “unauthorized” for purposes of section 4-3-404(1) of the UCC, which states that any unauthorized signature on a negotiable instrument is “wholly inoperative as that of the person whose name is signed, unless he ratifies it or is precluded from denying it....” Id. at 962. Accordingly, it reversed the trial court’s judgment awarding Willey partial recovery against Western Slope and Mayer on the $40,000 promissory note.8
II
The UCC provides that “[n]o person is liable on an instrument unless his signature appears thereon.” § 4-3-401(1), 2 C.R.S. (1992). “A signature may be made by an agent or other representative, and his authority to make it may be established as in other cases of representation.” § 4-3-403(1). However, “[a]ny unauthorized signature is wholly inoperative as that of' the person whose name is signed unless he ratifies it or is precluded from denying it.... ” § 4-3-404(1) (emphasis added). Under the UCC, an unauthorized signature is one made “without actual, implied, or apparent authority, and includes a forgery.” § 4-1-201(43).
[1264]*1264Accordingly, the question of whether Mayer and Western Slope are liable to Willey on the $40,000 note turns on whether Rhodes, as Mayer’s agent, had the authority under the power of attorney to sign Mayer’s name on the note. To resolve this dispute, we are guided by general principles of law and equity, including the law of principal and agent. § 4-1-103; Zions First Nat’l Bank v. Clark Clinic Corp., 762 P.2d 1090, 1094 (Utah 1988).
An agent can make his principal responsible for his actions if he is acting pursuant to either actual or apparent authority,9 regardless of whether the principal has knowledge of the agent’s conduct. Life Investors Ins. Co. v. Smith, 833 P.2d 864, 868 (Colo.App.1992); Restatement (Second) of Agency §§ 26, 27 (1958) (.Restatement). Actual authority incorporates the concepts of express and implied authority. Johnson v. Chilcott, 658 F.Supp. 1213, 1219 (D.Colo.1987); Restatement § 7 cmt. c. Express authority exists whenever the principal directly states that its agent has the authority to perform a particular act on the principal’s behalf. See Johnson, 658 F.Supp. at 1219; Zions, 762 P.2d at 1094. Implied authority, on the other hand, embraces authority to do “those acts which are incidental to, or are necessary, usual, and proper to accomplish or perform, the main authority expressly delegated to the agent.” Zions, 762 P.2d at 1094;
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Justice MULLARKEY
delivered the Opinion of the Court.
We granted certiorari in this case to decide whether a holder in due course of a promissory note, signed in the name of the principal by his agent who held a general power of attorney, could sue upon the note and enforce it against the principal. For the reasons stated below, we answer that question in the affirmative. Accordingly, we reverse the judgment of the court of appeals in Willey v. Mayer, 862 P.2d 959 (Colo.App.1993), and remand the ease to that court to resolve the undecided issues on appeal and for further proceedings consistent with this opinion.
I
In June 1982, Raymond C. Mayer (Mayer), president and director of Western Slope Investment & Development, Inc. (Western Slope), granted a general power of attorney to R. Martin Rhodes, II (Rhodes), an officer and attorney for Western Slope. The power of attorney, which by its terms was to remain in force until revoked by written instrument, authorized Rhodes to “buy, sell and deal in real and personal property of any description; to sign deeds, contracts and bills of sale; to borrow money and to grant any type of security interest in any of our real or personal property to secure loans; and to accept payment in his own name for any property sold, or payment of any money borrowed in my name.” 1 Between 1984 and 1989, Rhodes used this power of attorney to sign various corporate documents in the name of Mayer and Western Slope. In fact, Mayer had Rhodes sign documents for him in transactions involving Western Slope which were executed while Mayer was in prison in North Dakota in 1984 and 1985, including a $2 million loan agreement and a $3 million purchase option agreement.
In October 1988, without the knowledge of Mayer and while the power of attorney was still in effect,2 Rhodes signed Mayer’s name as president of Western Slope on a promissory note made payable to Rhodes by Western Slope in the amount of $40,000. Rhodes thereafter borrowed $10,000 from petitioner Clarence E. Willey (Willey) in exchange for a $15,000 promissory note payable by Rhodes to Willey. The $15,000 note to Willey was secured by an assignment of the $40,000 Western Slope promissory note, which in turn was secured by a deed of trust on property owned by Western Slope. Rhodes had also signed Mayer’s name as president of Western Slope on the deed of trust.3
After paying Willey $5,000, Rhodes defaulted on the $15,000 promissory note. Wil-ley then demanded payment from Western Slope and Mayer on the $40,000 note which Rhodes had indorsed to Willey to secure the loan. When they refused to pay the $40,000, Willey commenced this action to enforce the promissory note. Following a bench trial, the trial court entered judgment on the note in favor of Willey in the amount of $5,0004 plus interest and $5,000 in attorney fees.
In its order, the trial court found that although the power of attorney was in force [1263]*1263and effect at the time Rhodes entered the loan agreement with Willey, Mayer had not authorized Rhodes to sign his name to the $40,000 note. It found, however, that Western Slope and Mayer were precluded under section 4-3-406, 2 C.R.S. (1992), of the Colorado Uniform Commercial Code (UCC), from asserting Rhodes’ lack of authority to sign Mayer’s name to the note because Mayer’s failure to terminate the power of attorney upon Mayer’s return from prison constituted “negligence substantially contributing to the making of the note.” It further found that Willey was a holder in due course of the $40,000 note and that Willey took the note free of any fraud defense asserted by Western Slope and Mayer. Finally, the trial court found that Western Slope was the alter ego of Mayer and that Mayer thus was personally liable to Willey on the note.
The court of appeals reversed,5 holding that Western Slope and Mayer were not precluded from asserting Rhodes’ lack of authority to sign the note on Mayer’s behalf because Willey’s acceptance of the note from Rhodes “was not causally related to the negligence of Mayer in not timely revoking the power of attorney.”6 Willey, 862 P.2d at 962. The court of appeals also noted an “apparent contradiction” between the trial court’s findings that Rhodes simultaneously was authorized to affix the signature of Mayer, his principal, to the note by virtue of the power of attorney, yet not authorized by Mayer to sign the note because “Mayer had not ratified the signature.”7 Id. at 960. The court of appeals concluded, however, that Rhodes’ signature was “unauthorized” for purposes of section 4-3-404(1) of the UCC, which states that any unauthorized signature on a negotiable instrument is “wholly inoperative as that of the person whose name is signed, unless he ratifies it or is precluded from denying it....” Id. at 962. Accordingly, it reversed the trial court’s judgment awarding Willey partial recovery against Western Slope and Mayer on the $40,000 promissory note.8
II
The UCC provides that “[n]o person is liable on an instrument unless his signature appears thereon.” § 4-3-401(1), 2 C.R.S. (1992). “A signature may be made by an agent or other representative, and his authority to make it may be established as in other cases of representation.” § 4-3-403(1). However, “[a]ny unauthorized signature is wholly inoperative as that of' the person whose name is signed unless he ratifies it or is precluded from denying it.... ” § 4-3-404(1) (emphasis added). Under the UCC, an unauthorized signature is one made “without actual, implied, or apparent authority, and includes a forgery.” § 4-1-201(43).
[1264]*1264Accordingly, the question of whether Mayer and Western Slope are liable to Willey on the $40,000 note turns on whether Rhodes, as Mayer’s agent, had the authority under the power of attorney to sign Mayer’s name on the note. To resolve this dispute, we are guided by general principles of law and equity, including the law of principal and agent. § 4-1-103; Zions First Nat’l Bank v. Clark Clinic Corp., 762 P.2d 1090, 1094 (Utah 1988).
An agent can make his principal responsible for his actions if he is acting pursuant to either actual or apparent authority,9 regardless of whether the principal has knowledge of the agent’s conduct. Life Investors Ins. Co. v. Smith, 833 P.2d 864, 868 (Colo.App.1992); Restatement (Second) of Agency §§ 26, 27 (1958) (.Restatement). Actual authority incorporates the concepts of express and implied authority. Johnson v. Chilcott, 658 F.Supp. 1213, 1219 (D.Colo.1987); Restatement § 7 cmt. c. Express authority exists whenever the principal directly states that its agent has the authority to perform a particular act on the principal’s behalf. See Johnson, 658 F.Supp. at 1219; Zions, 762 P.2d at 1094. Implied authority, on the other hand, embraces authority to do “those acts which are incidental to, or are necessary, usual, and proper to accomplish or perform, the main authority expressly delegated to the agent.” Zions, 762 P.2d at 1094; see also Montrose Land & Invest. Co. v. Greeley Nat’l Bank, 78 Colo. 240, 244, 241 P. 527, 529 (1925); Restatement § 35 cmt. b.
A power pf attorney is a written document by which one party, as principal, appoints another as agent (attorney-in-fact) and confers upon the latter the authority to perform certain specified acts or kinds of acts on behalf of the principal. See King v. Bankerd, 303 Md. 98, 492 A.2d 608, 611 (1985). This instrument delineates the extent of the agent’s express authority and must be construed in light of the surrounding circumstances, including the customs and relations of the parties and the business in which the parties are engaged. Id.; Restatement § 34 cmt. h.
The power of attorney in this case expressly granted Rhodes the authority to “sign deeds, contracts and bills of sale; to borrow money and to grant any type of security interest in any of our real or personal property to secure loans; and to accept payment in [Rhodes’] own name for any property sold, or payment of any money borrowed in [Mayer’s] name.” It also stated that it was to be construed as a general power of attorney and that the list of enumerated powers conferred upon Rhodes was not meant to be exclusive or restrictive.10 Between 1982 and 1989, Rhodes used this authority to sign numerous documents and instruments on behalf of Mayer and Western Slope, including loan agreements and other contracts involving financial risk for Western Slope. Indeed, Mayer specifically arranged for Rhodes to use the power of attorney to manage the business affairs of Western Slope for Mayer while he was in prison.
In view of the above, the authority delegated to Rhodes under the power of attorney clearly included the power to sign negotiable instruments for Mayer. This authority is rooted in the express language of the instrument granting Rhodes the power to “borrow money and to grant any type of security [1265]*1265interest,” and it is a power that is necessary, usual and proper to accomplish the tasks specifically delegated to Rhodes under that instrument. Therefore, we agree with Willey that Rhodes had actual authority to sign Mayer’s name to the $40,000 promissory note.
Mayer and Western Slope initially contend, however, that even if Rhodes had actual authority under the power of attorney to sign negotiable instruments on Mayer’s behalf, that authority should be construed to cover only those signatures affixed by Rhodes which expressly indicate that Rhodes, and not Mayer, signed the instrument. We disagree. An agent’s authority to sign for his or her principal commonly encompasses the authority to sign the principal’s name without any indication that the signature was affixed by the agent:
Assuming that Peter Pringle is a principal and Arthur Adams is his agent, an instrument might, for example, bear the following signatures affixed by the agent—
(a) “Peter Pringle”, or
(b) “Arthur Adams”, or
(c) “Peter Pringle by Arthur Adams,
Agent”, or
(d) “Arthur Adams, Agent”....
§ 4^3-403 cmt. 3 (emphasis added). Moreover, because Mayer and Western Slope have failed to present any evidence that Rhodes was not permitted to sign Mayer’s name in this manner, we conclude that the power to sign for Mayer included the power to sign instruments without disclosing the agency relationship. See § 4 — 3—307(l)(b).
Mayer and Western Slope argue, alternatively, that we should not hold them liable on the $40,000 note because Rhodes was not acting with the intent to benefit his principal when he affixed the signature. To support this contention, they refer us to section 39 of the Restatement (Second) of Agency, which states that “[u]nless otherwise agreed, authority to act as agent includes only authority to act for the benefit of the principal.” See also McClellan v. Morris, 71 Colo. 304, 312, 206 P. 575, 579 (1922); W. Edward Sell, Agency § 84, at 68-69 (1975). We do not find that general principle dispositive in this case.
An otherwise authorized signature on a negotiable instrument is not converted into an unauthorized forgery when an agent, authorized to sign negotiable instruments in his principal’s name, abuses that authority by negotiating the instrument to a holder in due course for the agent’s own personal benefit. The question of whether the agent was authorized to pledge an instrument as security for a personal loan is separate from the question of whether the agent was authorized to sign his principal’s name to the instrument in the first instance. See Bank South, N.A. v. Midstates Group, Inc., 185 Ga.App. 342, 364 S.E.2d 58, 61 (1987); Grosberg v. Michigan Nat’l Bank — Oakland, N.A., 420 Mich. 707, 362 N.W.2d 715, 720 (1984); Rohrbacher v. BancOhio Nat’l Bank, N.A., 171 A.D.2d 533, 567 N.Y.S.2d 431, 433 (1991); Johnstovm Mfg., Inc. v. Haynes, 53 Ohio App.3d 42, 557 N.E.2d 1221, 1223 (1988); Jones v. Van Norman, 513 Pa. 572, 522 A.2d 503, 507 (1987). In this case, Rhodes was authorized under the power of attorney to sign Mayer’s name on the $40,000 note. What was not authorized was the use to which Rhodes put that note once signed. See Bank South, N.A. v. Grand Lodge of Free & Accepted Masons for Georgia, 174 Ga.App. 777, 331 S.E.2d 629, 632 (1985); Jones, 522 A.2d at 507; 6 Ronald A. Anderson, Anderson on the Uniform Commercial Code § 3-404:8 (3d ed. 1993).
This distinction is supported by those sections of the Restatement which deal specifically with an agent’s authority to sign a negotiable instrument on behalf of his principal. For example, the official comment to section 76 of the Restatement, found under the chapter entitled “Authorization to Make Negotiable Instruments,” states that
[i]f an agent is otherwise authorized ... the fact that the agent had an improper purpose in making or endorsing the instrument in the authorized form does not pre[1266]*1266vent a bona fide purchaser in due course, or a subsequent transferee from one, from having the same rights in the instrument and against the pi’incipal as if the agent’s act were authorized.
Restatement § 76 cmt. c. In a later section dealing with the liability of a principal to third parties where its agent acts with an improper purpose, the Restatement explains that:
Although an agent authorized to issue negotiable instruments in the name of the principal issues them in fraud of the principal to a payee who has notice of the facts, the principal is subject to liability upon the instrument to a holder in due course.... Where an agent, authorized to issue or endorse checks or other negotiable instruments, issues or endorses one to a named payee or endorsee, intending to simulate the name of a creditor of the principal and embezzle the proceeds, the principal is liable to a holder in due course.
Restatement § 166 cmt. d. Finally, the official comment to section 173 of the Restatement indicates that a principal who employs a general agent “in a position in which it is usual for such agents to issue negotiable instruments” is liable to a holder in due course of such an instrument issued by the agent in the name of the principal, even where the agent acted contrary to the principal’s directions and the holder in due course was unaware of the agency relationship. Restatement § 173 cmt. a.
Those sections describe the situation presented in this case — an agent who has actual authority to sign a negotiable instrument acts with an improper purpose and without authorization in transferring that instrument to a third party. In such cases, the principal is liable on the instrument to a holder in due course. See Jones, 522 A.2d at 507.
There are several policy reasons why it is preferable to place the risk that an agent may abuse his authority for his own benefit on the principal, rather than on the holder in due course who takes without notice of the principal-agent relationship. First, this rule increases the principal’s incentive to exercise care in selecting honest and reliable agents. Second, the principal is in a better position to supervise the agent’s conduct than is the holder in due course. Finally, because the principal enjoys the many benefits of the agency relationship, it is not unfair to require that it also bear the costs of its agent’s abuses of authority where they harm innocent third parties. See generally Harold Gill Reuschlein & William A. Gregory, The Laiu of Agency and Partnership § 26, at 69-70 (2d ed. 1990). Of course, the principal may seek recovery from the agent for any damages caused by the agent’s breach of fiduciary duty. See Mahoney Marketing Corp. v. Sentry Builders of Colo., Inc., 697 P.2d 1139 (Colo.App.1985).
Ill
In summary, we reject Mayer’s claim that the signature affixed by Rhodes, on behalf of Mayer, on the $40,000 note was “unauthorized” for purposes of section 4-3-404(1) of the UCC. Rhodes was authorized by the power of attorney to sign the promissory note, and his misconduct in using the note to secure a personal loan did not retroactively vitiate his authority to sign that note in Mayer’s name. Accordingly, we reverse the judgment of the court of appeals and remand the case to that court for resolution of the remaining issues on appeal and for further proceedings consistent with this opinion.
LOHR, J., concurs in the result only.
ERICKSON and KIRSHBAUM, JJ., join in the concurrence.