Business
How does it affect me if share prices fall?
Changes in the FTSE 100 and other indexes are not just for financial experts, they can affect our lives.
BBC Business•
Major tech firms have seen their stock values fall after a sell-off by investors following the US midterm elections.
The fall in the value of their shares across the world has been blamed on an expectation of a slowdown in AI development, although it comes after sharp rises over recent years.
As companies grow, they may issue shares. Many of the largest companies in the UK have shares which are bought and sold on the London Stock Exchange.
That could mean getting less than you expected if you cash in too much after stock markets have fallen, making it important to plan how to make up any of this shortfall, experts say.