You can't really price in the halving, it's impossible.The current value of bitcoin is a function of the current supply and demand. At the time of the halving the new supply issued to miners will be cut in half, and the miners are the ones who are most likely to sell their bitcoin because they need to pay the electric bill. All of a sudden they have less to sell, if the demand stays roughly the same at the time of the halving, the price will naturally increase over time.

That event is VERY hard to price in because the price of bitcoin at any given moment depends on the current number of buyers and sellers. Or think about it this way: If the halving DOESN'T increase price, a lot of miners will be forced out of "business" so to speak. That doesn't bode will for the health of bitcoin or the algorithm.