As you are probably aware, the U. S. Postal Service increased the price for mailing a first-class letter by 2 cents to 44 cents effective last Monday, May 11th. I am sure you also remember last summer's gasoline prices that were north of $4.00/gallon. At the time, Congress (and many others) was blaming “Big Oil” for excessive profits and demanding investigations. There was even legislation called "The Federal Price Gouging Prevention Act" introduced in Congress. The legislation would make it a crime to "sell crude oil or gasoline at a price that is unconscionably excessive."
In the last 90 years, the cost of gas has increase 8-1/2 times from $.25/gallon to $2.16/gallon. Even at last summer's high prices, the cost of gas increased figuring last summer's increase, the cost of gas was 16 times the cost of gas 90 years ago.
In that same time span, the price of a first-class stamp has increased 21 times it price in 1919 of $.02. Even compared to the Consumer Price Index, the cost of a stamp has increased at almost twice the rate. The chart below illustrates these figures (
Click on the chart to see a larger version).

To look at it a different way, if stamp prices had increased over time at the same rate of gas prices, a first-class stamp would only cost only 17 cents today instead of 44 cents. Or if gas prices had risen over time at the same rate as stamp prices, the cost of gas would be somewhere around $5.30.
It should also be pointed out that the price increase by the Postal Service is in response to a reduction in the volume of mail being processed (or 'sold'). So with declining 'sales', the Postal Service increases prices!? Compare that to what private companies do in the face of reducing sales. Do they increase prices? No, they cut prices to try and spur demand. That is Econ 101 (trust me, I was an econ major in college). That is why we saw a company advertising their entire stock of dress slacks as “Buy ONE, get TWO free!” before Christmas last year, and why we hear a company advertising that you can now buy a lake front lot for $139,000 when the one beside it sold for over $250,000 (wouldn't you hate to be that guy!)
Private enterprise fuels innovation. Look at UPS and FedEx. Do you think the USPS would be offering overnight delivery if these private carriers had not done it first? Do you think UPS or FedEx would hike prices to make up for declining volume? Does anyone besides me think that FedEx or UPS could make a profit delivering mail?
And politicians wonder why we don't want them involved in our health care?