What do you call a situation in which any recourse you gain is a loss of resource to someone else?

Based on this excerpt from "stopping by woods on a snowy evening" by robert frost, which statement best summarizes a theme in the poem? the woods are lovely dark and deep but i have promises to keep and miles to go before i sleep and miles to go before i sleep

Read the excerpt from act 3, scene 1, of julius caesar. servant. thus, brutus, did my master bid me kneel. thus did mark antony bid me fall down, and, being prostrate, thus he bade me say. "brutus is noble, wise, valiant, and honest. caesar was mighty, bold, royal, and loving. say i love brutus, and i honour him. say i feared caesar, honoured him, and loved him. if brutus will vouchsafe that antony may safely come to him and be resolved how caesar hath deserved to lie in death, mark antony shall not love caesar dead so well as brutus living, but will follow the fortunes and affairs of noble brutus thorough the hazards of this untrod state with all true faith.” so says my master antony

Danny went for a long bike ride he covered at least forty miles