Self-efficacy isn't the only performance enhancer on the market. Intrinsic motivation has also been linked with improved performance. Intrinsic motivation means the desire or willingness to do something out of enjoyment or fulfillment. (This is as opposed to extrinsic motivation - where you are motivated by external forces like money or power; or pro-social motivation, where you are motivated by the desire to help people.)
Intrinsic motivation is does more for performance (and that includes creative performance) than any other kind of motivation. That means, in order to be at your best it is more important to enjoy what you are doing than to make more money. That said, while liking your job is crucial to performance if you feel like you are being unfairly compensated the positive effects of intrinsic motivation will be lessened.
So managers, listen up! While you don't have to be a top paying employer to see creativity flourish in your office, you do have to provide fair and reasonable compensation.