In the graph shown, what change would increase production efficiency? 
Definitions:
Interest Rate
The proportion of a loan that is charged as interest to the borrower, typically expressed as an annual percentage.
Monthly Payments
Regular payments made every month, often in the context of loans or leasing agreements.
Callable Bond
A type of bond that gives the issuer the right to repay the bond before the maturity date.
Interest Rate
The percentage of a sum of money charged for its use, often expressed annually.
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