@ysmina-- I can't blame USPS for the price increases. It's not just competition and gas prices, the overall economy and inflation has a huge impact on USPS too.
USPS is one of the vital services in the US, it has been around forever. I don't think they are too keen on increasing mail stamp prices. They do it because they have to, they don't have enough revenue to cover all their expenses.
Plus, the increase in price is so little and the cost of sending mail in general is pretty low! I don't think we have the right to complain about this. We're already paying a very understandable price for the services USPS provides us. I've lived in several other countries before and believe me US is one of the most affordable places when it comes to reliable mail service.