The brief answer—I know you're pressed for time—is to start with an accounting of all the subsidies made and then try as best you can to come up with the overall rate of return. As Jack suggested, some of these have clearly paid off. I noted some of the winners myself, but a lot of them haven't, and we need a full accounting of what the rate of return on average is on these. You can then compare that to the rate of return on private investments.
On March 12th, 2020. See this statement in context.