Final answer:
A manager's myopic behavior refers to actions that improve budgetary performance in the short run but bring long-run harm to the firm.
Step-by-step explanation:
A manager's actions that improve budgetary performance in the short run but bring long-run harm to the firm are due to his or her myopic behavior. Myopic behavior refers to a short-sighted approach where the manager focuses only on immediate results without considering the long-term consequences. This can lead to decisions that may yield short-term benefits but ultimately harm the firm's financial stability or reputation.