The FTSE 100 broadly consists of the largest 100 qualifying UK companies by full market value. The total market value of a company is calculated by multiplying the share price of the company by the total number of shares they have issued. Many of these are internationally focused companies, however, so the index's movements are a fairly weak indicator of how the UK economy is faring and are significantly affected by the exchange rates of the Pound. A better indication of the UK economy is the FTSE 250 Index, as it contains a smaller proportion of international companies.