Classical economics is the popular theory prior to the great depression that the economy will automatically adjust to achieve full employment in the long run. Hence Option A is the answer.
A body of work on market theories and economic growth that appeared in the 18th and 19th centuries is referred to as classical economics. It alludes to the economics school of thinking that gained traction in the late 18th and early 19th centuries, particularly in Britain. It promoted laissez-faire principles and the notion of free competition, focusing on economic expansion and economic freedom.
Because of how supply and demand interact to affect price, traditional economists hold that the market is always open and free. There is no requirement to intervene because the market self-regulates. Laissez-faire economists are those who support this strategy for macroeconomic policy.
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