Which of the following statements about vitamin A,drawn below,is true? 
Definitions:
Economic Resource
Assets or inputs used in the production of goods and services, including natural resources, human resources, capital, and entrepreneurship.
Aggregate Economic Rent
The total earnings that factors of production receive over and above their opportunity cost, representing the extra income derived from resource ownership.
Ceteris Paribus
A Latin phrase meaning "all other things being equal," used in economics to isolate the effect of one variable change on an outcome.
Surplus Payments
Payments made above the market price, often by a government to producers, to encourage production or as a form of subsidy.
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