Goldman Sachs - stay invested, but Goldilocks scenario may expire soon

Strategist at Goldman Sachs believe 2018 could be another year of good, albeit flatter returns, but warn that "Goldilocks" conditions may have an expiration date soon.

The team says continued central bank tightening and a gradual pick-up in inflation could push bond yields and that could become a larger drag on returns compared to 2017.