The 2018 farm bill is the latest in a history that dates to 1933. Commodity assistance is the only program in all farm bills, but with evolutionary changes. Current farm commodity programs largely make payments to farms, a stark contrast to the 1930s when they limited supply, put a floor under market price, and dampened price increases via public stocks. Crop insurance, which began as an experimental pilot program in 1938, now has its own farm bill title. Almost all commodity and insurance programs have provided assistance based on a calculation specific to an individual commodity's price and/or yield. However, an evolutionary change to whole farm commodity programs may be in its infant stages. They provide assistance for variation in a farm's aggregate revenue across multiple crops. Whole farm experiments currently exist in both the commodity and crop insurance titles. Analysis of a whole farm commodity program finds that its payments differ by year from actual payments made by current commodity programs and are smaller in total.

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整个农场安全网计划：新兴的美国农业政策演变？

2018 年的农业法案是可追溯到 1933 年的历史上最新的法案。商品援助是所有农业法案中唯一的项目，但发生了演变。当前的农产品计划主要向农场付款，这与 1930 年代限制供应、设定市场价格下限并通过公共股票抑制价格上涨形成鲜明对比。农作物保险始于 1938 年的试验性试点项目，现在拥有自己的农业账单名称。几乎所有商品和保险计划都根据特定商品的价格和/或收益的计算提供帮助。然而，整个农产品项目的进化变化可能正处于起步阶段。它们为农场多种作物的总收入变化提供帮助。目前，商品保险和农作物保险都存在整个农场试验。对整个农产品项目的分析发现，其支付的年度与当前商品项目的实际支付不同，并且总金额较小。