Approximately how long people will hold their coins. If no one sells their coins in the long run, many people may lose confidence in cryptocurrency considering that they can not invest in cryptocurrency. It's unstable market situation, because coin can not be spread evenly. Few people invest in cryptocurrency, so crytocurrency rates fall at the lowest point. I think it's better balancing demand and supply, so that the price's growth of crytocurrency can continue to be green.