The Society has always allowed individual JWs to invest in the stock market. This policy was not created because they were caught investing in it. The Society did at one time, however, prohibit local congregations from investing or from having their congregation funds in interest bearing accounts up until the early 1990s. About that time the Society raised the interest rate on Kingdom Hall loans from 3% to 6%, and then they quietly allowed congregations to have funds in interest bearing accounts. I understand that in recent years the interest rate the Society charges has once again been reduced to 3%.