Which of the following would cause a firm's production function to shift upward?

Name: Which of the following would cause a firm's production function to shift upward?
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Question

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Increased training for the firm's workers would improve their efficiency and productivity, thereby shifting the firm's production function upward. Choices A and B would increase the level of production, but would not necessarily shift the production function itself.

Which of the Following Would Cause a Firm's Production Function