You don't give up, do you? I am perfectly aware that there has been inflation. But in other areas where there have been cost savings (air travel, electronics) things haven't increased at the same rate as general inflation. I bought my first RT air ticket in 1969 from Hartford to Miami. It cost me $150. This weekend I am in the middle of a similar RT flight from Newark to Palm Beach. It cost $230 dollars. Your first class stamp in that same time has gone from five cents (I think it had already gone from four to five) for virtually any one ounce envelope to 41 cents for only a subset of one ounce envelopes. (and more next week) You would think some of those lower air costs might be reflected in postage rates too. But no, the government NEVER lowers the cost for anything.
ML/NJ
In 1969 the old Post Office Department had had to CANCEL all maintenance related items for the indefinite future because Congress had failed to authorize those funds.
Earlier other Democrat Congresses had refused to allow postal modernization of parcel service so a large number of Postal Service Headquarters economists and operations folks puchased a moving firm in Seattle and named it United Parcel Service. They immediately unionized the place and set up an employee ownership system.
The price of a single First-Class stamp has little bearing on anything until you get to the creation of USPS.