The numbers can get very large like that. It depends on the particular amounts, but $2,000 a month times 30 million adults is $60 billion a month. If you multiply that by 12, you get numbers that are very big. Those numbers get very challenging.
There are other ways one can think about delivering these kinds of benefits, by phasing them out with income or by targeting them in different ways, but for the universal idea where you give the same cheque to everyone, it would be very expensive.