For some reason lost in the mists of time and irrelevant for decades, we use LSB on the 1.8 MHz, 3.5 and 7 MHz bands, and USB from 14 MHz up. We also use USB on 5 MHz for good reasons. There would be several advantages in making USB the standard everywhere: 1. The VFO knob will work the same way round all the time, i.e. clockwise to reduce audio pitch. This would be an improvement in ergonomics. 2. No need to remember to switch sidebands when using data modes, where USB is now the norm. 3. Better compatibility with non-amateur users in shared bands 4. A simple positive 'frequency shift' relationship between modulating frequency and radiated frequency, without inversion, making mental calculations easier. 5. Simplicity and economy in transceiver design and manufacture once LSB becomes superfluous. Implementation: clearly it would be a mess if we had any kind of gradual changeover with people using a mixture of sidebands. It would be necessary to get worldwide IARU agreement for a 'sideband switchover time', possibly 00:00:01 UTC on January 1st in some future year, and give it months of advance publicity.