What could cause huge anguish, though, is if the fall in share prices continues. This is already the longest bear market, though not the deepest, since the 1930s but some suggest there is still further to go. Applying trusted historic valuation yardsticks, the research boutique of Smithers & Co run by our columnist Andrew Smithers reckons that British shares are still 40% overvalued and US stocks have a further 58% to fall to reach fair value.