Traders Watch a Water Index the Way Others Watch the Weather

LONDON — The Cerulean Exchange, the commodities and carbon house that dealers treat as a barometer of resource stress, has spent October registering a slow, insistent climb in the contracts tied to desalinated-water cost, said Rosa Quintero's floor sources at the exchange. The move is not yet a shock — but the dealers pricing it are behaving as though one could arrive, hedging desalination inputs and water-utility exposure with an unusual seriousness for contracts that most of the market ignored a year ago. "You watch the water tape now the way our grandparents watched the weather report," said one Cerulean trader who asked not to be named. "It tells you what kind of week the real economy is going to have." The exchange's water-linked index closed the week at its highest of the year, tracking almost exactly the delivered-cost climb that families like the Bhattis on the Makran corridor are recording by pencil. When the abstraction on a London screen and the notebook on a Makran wall report the same number, the trader said, "you stop calling it speculation."