This scene takes place immediately following the Supreme Court decision that legalized gay marriage. In the marriage market, a law that prevents gay marriage is essentially a quota of 0 marriages, which leads to huge amounts of deadweight loss. At this extreme, the quantity demanded exceeds the quantity supplied, which can be seen in the second portion of the scene when the Jay and Manny arrive at the course house. There is a surprisingly deep conversation about the role of economics in same-sex marriage.
See more: demand, efficiency, inefficiency, markets, quotas, role of government, supply, transaction barriers
Economics of Modern Family 