In $2017,$ the average baseball player earned $$4$ million per year. Suppose that these baseball players spend their entire $1$ goods and services each year and save nothing. Assuming the players do not borrow any money, the sum of the income baseball players must equal the sum of expenditures made by the baseball players because:

if nothing from income is left over after spending, then spending must exactly equal income. baseball players should save some of their individual incomes.

baseball players are 'high rollers' and spend a lot.

baseball players have a high income and they spend a lot.