Pierre Rochard, founder of bitcoin consulting company Bitcoin Advisory, debated in the Bitcoin community about whether the transaction costs were high enough to support the continued use of the Bitcoin network. He said the community must question whether the transaction costs alone would motivate miners in the future. In the original white paper, the total supply of Bitcoin was limited to 21 million. Although the final bitcoin is not expected to be produced until 2140, block rewards will continue to decline in the next century. Miners who facilitate bitcoin transactions and secure bitcoin network security will rely more on transaction costs as a source of income, as bitcoin returns are declining. Some believe that bitcoin may need to introduce permanent inflation to make up for this.