From the Jon Chait link:
To make a long story short, prohibition led to the dismantling of many small breweries around the nation. When prohibition was lifted, government tightly regulated the market, and small scale producers were essentially shut out of the beer market altogether. Regulations imposed at the time greatly benefited the large beer makers. In 1979, Carter deregulated the beer industry, opening back up to craft brewers. As the chart below illustrates, this had a really amazing effect on the beer industry:
The above blockquote and chart come from an E.D. Kain link in Chait’s post.
Here’s Chait’s take on the topic:
It’s worth noting that Carter got no political credit for this move, and that the benefits didn’t appear until long after he departed. Some policy successes — like a successful war or peace treaty — yield immediate political dividends. But others produce little change until many years later, by which time everybody has forgotten your policy had anything to do with it.
In related news (and the reason for the linked posts — today is International Beer Day (well at least for another hour or so.)