Basic economic theory states that as the supply decreases and demand either remains the same or increases, price will increase. That increase will "bring in more bitcoin" from holders that are now willing to sell at this higher price. The higher the price, the more holders come in willing to sell. Eventually the price stabilizes at an equilibrium (great movie BTW)

That being said, this next supply shock / demand shock that seems destined to happen post halving is very interesting to us. It will be a first in human history. A point where the entire globe (well not everyone but most with money) has access to trade a good without anyone able to stop it, halt trading or whatever coupled with a completely fixed supply. This has never happened before. Ever.

Will the price just keep Mooning? $100k per bitcoin? $1m? $10m? $100m? Literally no one knows as there is no previous data to estimate from. It should be quite interesting!