The US is pushing China to a 'red line' and companies that do business in the country need to come up with a 'plan B,'  Yale economist says

• US-China tensions are nearing a "red-line," according to Yale economist Stephen Roach.
• Roach said the US's support for Taiwan could spell trouble for firms that do big business in China.
• He warned of a potential conflict between the two nations, and said US firms need to come up with a "plan B."

US-China tensions are reaching a critical point, and US companies that do business in the country might want to come up with a "plan B" in the event relations between the superpowers deteriorate, according to Yale economist Stephen Roach.