Take the NYSE, for example, which is considered the most prestigious exchange in the world, its basic structure remains the same as it was decades ago. The major changes were at the beginning, back in the 19th century when the Buttonwood agreement was signed, and the shift to electronic processing in 1995. Other than that, the system still remains largely the same.
The Forex industry, on the other hand, has existed since currencies were available and it has been evolving with time. Major changes started in 1973 when free-floating currencies became available. Then, electronic trading also came about, the dot-com bubble and the widespread internet access which allowed retail brokers to pop up around the world. The latest changes can be seen through social trading using social networks and trading algorithms which Fintech companies are all over this year.