App from Mac App Store. What if I change Macs? The Mac App Store is really convenient, but under some circumstances, I am confused on how it manages the installation. Here I have two questions:


If I buy an app from the Mac App Store, then delete it, can I re-install it or do I have to buy it again?
If I buy an app from the Mac App Store, can I install it on more than one Mac? If I can't, can I delete it on the Mac that I purchased the app from, and then install it on another Mac?
There is no limit on installing one copy of each app on every Mac you own or control for personal use. 

You only pay once and can re-download the app even if the developer changes prices later.