Happily ever after doesn't come cheap in the U.S. Couples looking to tie the knot pay an average of about $30,000 between things like caterers, flowers and photographers to capture the day. But why is it that weddings cost more than other large-scale parties? In this week's Benchmark, former White House economic adviser Austan Goolsbee explains how the concepts that we learned in freshman year economics class determine why celebrating eternal love costs so much. Kate Smith is also joined by guest host Brian Chappatta, a government bonds reporter at Bloomberg News and soon-to-be married man, who gives us his experience in planning a wedding.