According to Kirwan, the diversified farms already had equipment, such as drying barns to cure the tobacco. After the quotas were lifted, they could capture the economies of scale.

"A drying barn is the same size whether you're drying a little tobacco or a lot of tobacco, so lifting the quantities allowed them to actually fill the drying barn and become much more efficient," Kirwan said.

"Because they already had the invested capital, it became much more profitable for them to stay in tobacco and get bigger than it would have been to switch to a different crop."

Farmers were also able to save due to input reallocations, such as being able to shift fertilizer and electricity and workers.

"You get this double kick from removing the quota," Kirwan said. "When the quota was removed, it allowed resources to move, giving an 8.3 percent increase, but the removal of the quota itself gave 22 percent. That's a total of a 30 percent increase just by removing this regulation."

Kirwan said the findings from the study can be analogous to other commodity programs.

"In agriculture, there have been these types of  farm programs for about 80 years and there is some variance, but this was one of the few times that we could see an absolute end to a program with no hope of coming back.

"Other programs may not be as binding as the tobacco program with quota limits, but when we're distorting the market price with subsidies or we're distorting a farmer's production choices by saying, 'If you grow vegetables, then you no longer get subsidies for your corn,' then we're distorting their productivity," Kirwan said.

He noted that the study focused on productivity, not equity. So although the farms were much more productive, it did put many small farmers out of business. He said the findings could help guide policy makers who are deciding whether or not to change quota or subsidy programs.

"They have to weigh this potentially huge efficiency gain with the consequences on the equality side — possibly creating fewer small farms. Which is more important? Having a lot of small farms or fewer, more productive farms?

"There are anecdotes that subsidies prop up inefficient farmers who shouldn't be farming anyway, but they are just that, anecdotes," Kirwan said. "By doing this study, we could see just how much more productive the new tobacco farmers were. We looked at the demographic differences in these two groups and confirmed that these new, more productive farmers are young."

"Aggregate and Farm-level Productivity Growth in Tobacco; Before and After the Quota Buyout" was published in the American Journal of Agriculture Economics. The article was co-authored by Shinsuke Uchida and T. Kirk White. Some funding was provided by the USDA.