Encouraged by years of central bank easing, investors are ploughing too much cash into unproductive and increasingly speculative investments while shunning businesses building economic growth, the OECD warned on Wednesday. In its first Business and Finance Outlook, the Organisation for Economic Cooperation and Development highlighted a growing divergence between investors rushing into ever riskier assets while companies remain too risk-averse to make investments. It urged regulators to keep a close eye on investors as they piled into leveraged hedge funds and private equity and poured cash into illiquid assets like high-yield corporate bonds.