> I don't see much reason to believe that any ship built because of the Jones Act would've been built in the US in absence of the Jones Act.
No ships were built because of the jones act, that's the problem. The jones act required people to do B if they wanted to do A, so they stopped doing A. A is intercoastal shipping. Nothing in the jones act encouraged B besides the opportunity to do A.
In your roulette example, the example isn't between a specific number and black. It's the jones act is playing roulette versus the non-jones act where you don't. Are you guaranteed to not have lost money by some other means if you never played roulette? No. But roulette is a game that provably loses over the long run, and so we should stop playing it.
No ships were built because of the jones act, that's the problem. The jones act required people to do B if they wanted to do A, so they stopped doing A. A is intercoastal shipping. Nothing in the jones act encouraged B besides the opportunity to do A.
In your roulette example, the example isn't between a specific number and black. It's the jones act is playing roulette versus the non-jones act where you don't. Are you guaranteed to not have lost money by some other means if you never played roulette? No. But roulette is a game that provably loses over the long run, and so we should stop playing it.