________ marginal opportunity cost implies that the more resources already devoted to any activity, the payoff from allocating yet more resources to that activity increases by progressively smaller amounts

Would an economist consider clean air a scarce resource? Explain

What will be an ideal response?

With a given income and prices of goods, Marcus will be in a consumer equilibrium if ________

A) his marginal utility from all goods is the same B) he purchases the same amounts of all goods C) he maximizes his total utility D) his marginal utility from all goods is at its maximum