China’s latest proposed list of industries that would be off-limits to foreign investors shows more work is needed to agree on a new investment treaty with the United States, U.S. Commerce Secretary Penny Pritzker said in an interview on Monday, Reuters reported. Reaching an agreement over the so-called ‘negative list’ of businesses in China that are out of bounds to foreign investors is crucial in sealing a treaty between Beijing and Washington that would lift investment flows between the world’s two largest economies. The issue has been made more prominent by a wave of Chinese acquisitions of U.S. companies that have raised questions over the inability of U.S. companies to buy assets as freely in China.