Answer:
ΔBrad /ΔBeef
Step-by-step explanation:
Opportunity Cost is the cost of next best alternative forgone while making a choice. Eg : If a school teacher is Rs 20000, he / she could have taken coaching classes & earned Rs 15000, the opportunity cost of school teaching is coaching earnings i.e Rs 15000.
Marginal Opportunity Cost is the quantity of a good sacrifised to gain an additional quantity of another good .
MOC = Δ good sacrifised /Δ good gained.
MOC (Brad for a Beer) = ΔBrad /ΔBeef
{∵beef = good sacrifised , brad = good gained}