This law only holds true for very broad catagories of technologies e.g. use of fire, hydraulics, electricity, radio, genetics, atomic power, nanotech, etc. If

This law only holds true for very broad catagories of technologies e.g. use of fire, hydraulics, electricity, radio, genetics, atomic power, nanotech, etc. If you try to apply the it to something more narrow you run into the problem that many specific technologies come in and out of favor depending on market conditions.