The raw sugar futures market in New York climbed 18 December almost four percent, supported by increased cash purchases of that product, traders said. This result confirms the recovery in prices began in late August. The gap between demand lower production to consumption in the current season and the slight strengthening of the Brazilian real exchange rate against the US dollar They are the main causes, but the Rabobank report warns that the recovery is vulnerable to a possible currency devaluation in Brazil. Uncertainty also focuses on the negative impact of the weather in producing areas in the world.