Mario consumes only two goods: tacos and orange juice. An extra taco would give him 60 more utils. One more orange juice would give him 20 added utils. Tacos sell for $3 each. An orange juice costs $1. Mario: O should purchase more tacos and less orange juice.. O is buying too many tacos and not enough orange juice. O has maximized his utility. () needs to equate the marginal utilities for tacos and orange juice