Answer:
decrease his revenue, since his output has decreased and the price remains the same
Step-by-step explanation:
A perfect competition is characterized by many buyers and sellers of homogenous goods and services. Market prices are set by the forces of demand and supply. There are no barriers to entry or exit of firms into the industry.
In the long run, firms earn zero economic profit. If in the short run firms are earning economic profit, in the long run firms would enter into the industry. This would drive economic profit to zero.
Also, if in the short run, firms are earning economic loss, in the long run, firms would exit the industry until economic profit falls to zero.
Because Tom is a price taker, his activity is would affect the price for t-shirts, if he reduces his output, price would remain unchanged and as a result, revenue would fall.