Within the oil and gas industry, it took into account production in other states, in effect bringing total available supply, (including imports, which were small) within the principle of prorationing to market demand. Allowable oilfield production was calculated as follows: estimated market demand, minus uncontrolled additions to supply, gave the Texas total; this was then prorated among fields and wells in a manner calculated to preserve equity among producers, and to prevent any well from producing beyond its maximum efficient rate (MER).