Concept:The invisible hand describes how free market forces, such as supply and demand, naturally cause prices to rise and fall without central control.
Explanation:A downturn in share prices means stock prices are falling due to changing market conditions.
This fall occurs when many investors sell shares, so the demand for those shares drops.
No single person or government agency orders the fall; it is the combined result of individual buyers and sellers acting freely.
Adam Smith called this automatic self-correction of prices the invisible hand.
Thus, the downturn in share prices is a highlight of the invisible hand, not of government regulation, consumer rationality, or resource allocation.
Answer:B. the invisible hand.