Robusta beans, which are grown in Southeast Asia, and known for their bitterness (and use in instant coffee), have been getting more expensive, too. But their price increase has still been dwarfed by that of arabica, and that’s only further widening the price gap between the two. The price difference is now the highest it’s been since January 2013, according to Rabobank analysts. And it’s come despite an expectation that the price gapwould actually shrink.
Robusta beans have long been recognized for their cheapness, but also their lower quality (in the eyes of higher-end coffee makers, anyway). The bigger that price gap gets, the better the chances robusta beans begin to make their way into more and more coffee blends. [link]