The price index used to adjust rental rates increased a whopping 11.5 percent last year and it's not slowing down. In the first few weeks of this month that same index has increased at an even faster rate. Officials say they're paying attention. President Dilma Rousseff continues to emphasize her commitment to cutting public spending in a bid to keep inflation under control. And after raising interest rates last week, the head of the Central Bank suggested that low unemployment and rising wages, while good for workers, are increasing demand in an already overheating economy.