The author of today’s article has long subscribed to the investing principle that stock prices follow earnings. However, while he still considers earnings growth to be a reliable indicator, he is “becoming convinced that an even better leading indicator may exist” – one that investors might be wise to consider adding to their arsenal. What is this indicator – and how does it help to explain the success of companies such as Apple and the failure of companies such as Groupon? CLICK HERE to find out.