No marginal costs
The most interesting and the most important form of leverage is the idea of products that have no marginal cost of replication. This is the new form of leverage. This was only invented in the last few hundred years. It started with the printing press. It accelerated with broadcast media, and now it’s really blown up with the internet and with coding. Now, you can multiply your efforts without involving
-- Eric Jorgenson, The Almanack of Naval Ravikant.