If the sum of individual and collective decisions leads to a level of output, prices, and employment that most people do not find satisfactory, Keynesians believe that __________.

Group of answer choices

a. market forces will automatically and quickly correct mistaken decisions

b. this outcome may persist because corrective market forces are ineffective

c. government intervention will make things worse, so the role of government should be minimized

d. government intervention is not necessary because market forces, although slow, move in the right direction