Economist friedrich hayek argued that can serve as signals in an economy.
a. producers
b. consumers
c. government
d. prices

I think the correct answer from the choices listed above is option D. Economist Friedrich Hayek argued that prices can serve as signals in an economy. The prices can tell whether economy is in a good state or not. Most of Hayek’s work from the 1920s through the 1930s was in the Austrian theory of business cycles, capital theory, and monetary theory. 

Lol that is s funny : )