'Buffett Indicator' hits its highest-ever level ahead of billionaire's retirement

The 'Buffett Indicator' has hit its highest-ever level at 221%, according to market research service GuruFocus, ahead of billionaire investor Warren Buffett's planned retirement. The indicator compares the overall value of US-listed companies divided by the US economy's GDP, with its current ratio signalling the US companies are "significantly overvalued". The market may show -0.5% annual return.