AP Microeconomics

Answer - D - All of the above are main reasons for a general shift in supply.

Key Takeaway: The easiest way to remember all of the many major things that could cause a change in the supply is to use the acronym ROTTEN:

R = Resources = costs of resources
O = Other = prices of other goods
T = Taxes = subsidies and taxes
T = Technology = changes and progress in technology
E = expectations = suppliers’ expectations
N = number = the number of suppliers involved