Q:

Is supplying new ETH prohibitive with Casper or an economic decision?

It has been said that the creation of new ETH will be discontinued with Caspar and PoS. Is there a fundamental reason why this is necessary, rooted in the protocol or is this a deliberate decision by the Ethereum Foundation?

A:

The creation of Ether is a subsidy to cover the costs associated with proof of work. Since Casper and/or proof of stake will no longer incur these costs, all computing resources of miners can be focused on transaction processing, which they get paid for. No reason to double pay miners.

