Yes, because if it is not his/her self-interest they will not be able to work as hard as they can and won’t fully participate, while if they wanted to do it, they could go all out as it is something they want to achieve.
The personality dimension where Ronald acts is called the openness. It is where the individual or Ronald is open to new things and tries to discover things that he hasn't even tried yet, in order to gain experiences and knowledge that he hasn't experienced before.
Tariff makes the most sense. Embargo is a ban on goods or a country, subsidy is money granted from the government to a business and has nothing to do with trade, quota is a limited amount of a product and again doesn't really have anything to do with trade.
