All signs point to the largest-ever corn crop in history this fall and the third year in a row of plunging farm incomes. But with prices potentially tumbling to $3 by harvest, corn growers with high levels of revenue-based crop insurance could buffer some of the price damage. In fact, many corn growers could trigger 2016 crop insurance payouts with no yield loss. Producers sometimes forget revenue-based crop insurance protects against a growing-season price collapse as well as sub-par yields, pointed out Jason Alexander, vice president of crop insurance for Louisville-based Farm Credit Mid-America. Since the Risk Management Agency set the spring guaranteed price for corn at $3.86 per bushel on March 1, prices have fallen to about $3.40 and could bottom near $3 by harvest.