London-based private bank Coutts warns of the possible bursting of the bubble in emerging market debts and recommends a switch towards equities and other assets less vulnerable to a sharp withdrawal of investment. According to Gary Dugan, the bank's chief investment officer for Asia and the Middle East, investors should beware in the Middle East of a significant sell-off in sukuk. In recent weeks, financial firms including Fitch Ratings and Goldman Sachs have joined a debate over whether a "bubble" is brewing in fixed-income markets.