Why do some of the world’s largest gas stations sell ethanol?

When it comes to gas stations, there are a number of options, but there are also many variables.

It’s all about the price.

When the price of gasoline drops, some of those stations stop selling ethanol.

In some cases, that means they’re no longer able to make money.

But that could change in the near future, with more retailers opening up.

This article originally appeared on Buzzfeed and is republished here with permission.