It actually happened a while ago and nobody noticed until now. Here’s how it will work. A developer can set the MSRP for an app. They will get the higher of 20% of the MSRP or 70% of the retail price. So,  developer can set an MSRP of $10. Amazon can price it at $10 and the developer would get $7. If the retail price drops below $2.86, the developer would get the minimum of 20% of their MSRP, in this case $2. Will developers like this? If they make money, they’ll like it. Otherwise, they’ll blame Amazon’s meddling on their lack of success.