Final answer:
In 2019, 80-90% of equity-futures and cash-equity trades were executed by algorithms, showing the prominence of automated trading systems in the financial markets.
Step-by-step explanation:
In 2019, the percentage of equity-futures and cash-equity trades executed by algorithms is reported to be 80-90%. This indicates a high level of automation in the financial markets, where computer programs are designed to follow a set of instructions for trading. With such a significant proportion of trades being automated, it highlights the importance of algorithmic trading in modern finance.