Amazon unveiled a new online storefront called Amazon Ignite that will allow educators to earn money by publishing – online, of course – their original lesson plans, worksheets, games, and more. The entry into the curricular marketplace is obviously motivated by a perceived market opportunity – and that's not wrong. The vast majority of teachers are supplementing their core curriculum or don't have one to start with. Yet we know almost nothing about the quality of such supplementary materials. Our new study helps fill that void.