As sentiment swings bullish, it pays to be ready when it's bearish

Investors are feeling good. Economic growth around the world has picked up noticeably, led by manufacturing and tech, but inflation remains stubbornly low.

As such, stock and bond markets are at new highs as investors bet the low interest rate environment will last forever.

A number of stocks - like Facebook, Alphabet and Apple - are incredibly dominant in their fields of social media, Internet search and premium smartphones, with valuations rising to match their promise. Liqu…