One more trip, one more trip. And that is how today was the day of the stock market on Wall Street. It was an authentic up-and-down session that has now been experienced on the other side of the Atlantic, in the face of trade tensions between the US and Beijing.Right at the opening, all down. The US stock exchanges thus reacted to Beijing's retaliation for the new US-targeted customs duties.Indeed, only 11 hours after the Trump Administration presented the list of some 1,300 Chinese products [such as industrial technology, medical and transport-related products] that will be priced at 25% Beijing was responding with its own list [like soybeans, maize, airplanes, automobiles, beef and chemicals] - and to charge the same amount: 50 billion dollars.Throughout the day, US indices have evolved in the face of fears or consumer confidence, but have ended up in the green, with moods being largely tempered by statements by US Commerce Secretary Wilbur Ross, who referred that the Trump Administration is willing to negotiate with China to try to resolve these frictions.