Why are weddings so expensive? Historians find the answer

The modern American couple starts life with a heavy financial burden: In a big city like Chicago, the average wedding costs between $22,500 and $37,500. Yet in the 1930s, it was cheap, costing around $400. There's no question that wedding prices are out of control. What went wrong?

I went to the Chicago History Museum's "I Do! Chicago Ties the Knot" exhibition, whose historians have figured out how it happened.