Delinking US economy from that of China difficult and undesirable

US supermarket giant Costco opened its first Chinese outlet on Tuesday in Shanghai, five days after the United States leader said: "Our great American companies are hereby ordered to immediately start looking for an alternative to China including bringing your companies home and making your products in the USA."

Whether the US leader has the right to issue his desire as an order remains a question. But what Costco has done brings home the fact that whether US companies leave or stay in China should really be a business decision.

The global supply chains were forged over time and for a reason. It is na?ve to believe that anyone can unravel them in a day on a whim.