If you don't like the previous suggestion, how about the housing market or commercial real estate?
Both are cyclic because of the market failures due to the time it actually takes to build new buildings.
A great deal has been written about the economics of real estate too.
In fact, there is no market that hasn't seen a failure! For example, the stock market is usually touted as a best example of a perfect market, but even there, every so often, the exchanges choose to stop trading because they think the market is behaving "irrationally" (a stock is falling too fast, etc.)
Or there was the famous short-term change in rules of the Chicago silver (commodities) market when two brothers managed to corner the market.
(a web search will turn up dozens of other articles on this)
If changing the rules does not signal a market failure, what does?
So you should have no trouble finding plenty to write about no matter which real market you choose.