_________ says that the marginal product of a factor input initially rises with its employment level. But after reaching a certain level of employment, it starts falling.
In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No error'. I was shocked to hear (1)/ that her husband (2)/ died of an accident. (3)/ No Error (4)