Investors in Asian technology stocks have been so bullish that it doesn’t take much to start a panic selloff. Shareholders in Samsung Electronics had a taste of that Monday. The largest stock in the Korean market fell 5%—the most in more than a year—apparently triggered by Morgan Stanley downgrading the stock one notch to “Equal-weight.” That was enough to sink Korea’s benchmark Kospi index by 1.4% too. The bank is, understandably, questioning whether the memory-chip-market boom that has fueled a doubling in Samsung’s shares...

Source: Wall Street Journal November 27, 2017 10:00 UTC