In an interview with Yahoo Finance, Michael Saylor, executive chairperson of MicroStrategy, said the bitcoin strategy was simple: "I've been saying every day for the last four years buy bitcoin, don't sell bitcoin, just keep buying BTC with your spare cash and it will always appreciate against the dollar." Michael Saylor believes bitcoin should be part of a long-term investment portfolio and recommends investing unwanted funds in cryptocurrencies for four to ten years.