There have already been two bitcoin halvings since bitcoin launched in 2009, one in 2012 and another in 2016. Bitcoin halvings are scheduled to continue roughly once every four years until the maximum supply of 21 million bitcoins has been generated by the network, something that won't happen until well into the next century.

Whether the upcoming bitcoin halving has been "priced in" by the market has become a controversial issue among investors. Generally, in well-developed markets, equity, commodities and currencies are priced based on future expectations—suggesting that as bitcoin traders and investors are aware of the May halving, the price will have already made the gains related to it.

CZ disagrees, however, telling BlockTV: "The market is not efficient. Most people don't get information quickly. People need a lot of time to let concepts sink in and adjust."

Many are hoping the 2020 bitcoin halving will see a repeat of the last cut to supply. Bitcoin prices doubled in 2016 and soared 13-fold the following year.

However, CZ warned that "historic events do not predict future events, so don't take that too literally," but explained the bitcoin halving will mean "it costs miners almost double what it does now to produce one bitcoin. Psychologically, those miners won't be willing to sell below that price."

https://www.forbes.com/sites/billybambrough/2020/02/23/binance-ceo-gives-rare-price-prediction-says-this-is-when-to-buy-bitcoin/#796ae5273174