"No country is 100% open to a foreign business presence," says Zha Daojiong, professor at the School of International Studies at Peking University, comparing a national market to a family home. He argues that the key is not simply how open a market is but whether its rules are clear and consistently applied. For China-US business ties, he says, non-discrimination matters just as much, with companies judged on the quality of their products and services rather than treated differently.