The benefits are small but it is only small as Bitcoin has not been adopted globally. People can use Bitcoin for buying and selling in some part of the world but it is not widely accepted yet therefore there is not much Bitcoin can do to the economy but because of the profits that people are getting from their investment in Bitcoin or from trading, they are using those profits to buy things or make establishment that contribute to the economy as they are paying taxes and hiring workers which they also pay them. Bitcoin is not economically useless, those words are just coming from an economist that do not understand Bitcoin therefore he is going to call Bitcoin useless. Bitcoin is a valuable assets and anybody that owns Bitcoin can testify to this fact because they have experience what Bitcoin can do.