 Tether's price decreased to lows of $0.90 on 15 October 2018 on speculation that investors are losing faith in the token.On 20 November 2018, Bloomberg reported that U.S. federal prosecutors are investigating whether Tether was used to manipulate the price of bitcoin.In 2019, Tether surpassed Bitcoin in trading volume with the highest daily and monthly trading volume of any cryptocurrency on the market.