THE FTSE 100 managed to finish positive last week, even after the threat that the UK&rsquo;s S&amp;P AAA credit rating may be removed. Nevertheless we can expect some mediocre profit-taking this morning.<br /><br />Later in the week we have a host of key US economic indicators such as durable goods and new home sales on Thursday (with month-on-month gains expected in both) and on Friday we have the market driver of the week, US GDP. Any improvement on last month&rsquo;s annual rate of minus 6.1 per cent will probably go down well.<br /><br />GFT is calling the FTSE 100 index to open down around 15 points today at 4,350.