Stock indexes’ dead weight

Diversify. Diversify. Diversify. For years it was a trusted mantra: The simple idea that to mitigate the impact of nasty surprises from one company or sector, investors should hold a diversified portfolio of stocks
from a cross-section of industries.

Refashioning beta

The emergence of alternative systematic equity indices raises profound questions about how we define
‘the market’, and how pension funds should benchmark and invest their core portfolios, writes Martin
Steward