That is true, but the unintended consequences should be factored in. Abundance tends to lower prices, but production costs don't tend to follow. Less incentive to produce, or subsidies required. A balance has to be reached.
Subsidies are a whole different issue. For instance Michigan is the top tart cherry producer but subsidies are still given largely due to the financial hit caused by competition from overseas. Apples are taking a beating for the same reason.