Which of the following is an asset use transaction?

a. Purchased machine for cash
b. Recorded insurance expense at the end of the period
c. Invested cash in an interest earning account
d. Accrued salary expense at the end of the period

By 2020, automobile market analysts expect that the demand for electric autos will increase as buyers become more familiar with the technology. however, the costs of producing electric autos may increase because of higher costs for inputs (e.g., rare earth elements), or they may decrease as the manufacturers learn better assembly methods (i.e., learning by doing). what is the expected impact of these changes on the equilibrium price and quantity for electric autos?