Sugar is 3x as expensive in the US as it is in latin america. Why? We have restrictions on imports, and thus we have to have american companies growing sugar. We are missing out, and if we could remove those protectionist laws, we wouldn't have all our food companies relying on HFCS. (I'm not saying that HFCS is any more unhealthy than sugar, but it would help give consumers a choice.)
Let's ponder about China. Chinese entrepreneurs already have an at-home advantage of knowing chinese customs and culture and legal frameworks. If they were not protectionist, then they could be benefitting from cheaper products, which would allow them to accumulate capital faster, which allows them to create new businesses faster. Additionally, the level of success required for their business is not at a "playpin" level-- if they can be successful in the hypothetical non-protectionist chinese market, then they can be successful anywhere in the world with an open market. It's also really important for business people to be getting the proper signals from the market-- i.e., what quality of product they need to provide and at what cost. If you're performing protectionism, you're giving people false numbers.