As it should have. He was talking about stocks, and there's a big difference between being a customer of a company and
knowing a company. It's the latter sense in which he meant one should know what (company) one is investing in.
Still, when it comes to industries, knowing means something different. Working in an industry can give you a good sense of the health of that industry if you are attentive.
I was wondering whether you had any thoughts about how the
CAPE index model will be adjusted for the new sector since this is a thread about DSENX. When real estate was
carved out of financials, the
CAPE index was modified to use a non-SPDR index fund, IYR.
I imagine that was done because it needed an index fund with a ten year history, and by definition, XLRE was a new fund without a history. Though IYR might have been chosen because it was more inclusive, holding mortgage REITS such as NLY that XLRE excludes.
However, that might mean that the
CAPE index added a new group of companies (mortgage REITs) that it had not tracked before. A discontinuity. Regardless, another imprecision arose - the old history of the financial sector included real estate, while the sector itself no longer did. Was any attempt made to correct for this (e.g. recalculating the financial index history after pulling out the real estate component)?
This time things are even more interesting. The
CAPE index tracks XLK for technology, but
XLK combines technology and telecom. That's why there are ten "sectors" that the
CAPE index uses, while there are eleven S&P sectors.
It is possible that State Street will decide to keep XLK as it is, in which case the
CAPE index won't have to do a thing (other than watch the technology+communications "sector" continue to grow in weight). But what if State Street does finally create a communications Select Sector SPDR? There won't be any history for the new SPDR (just as there was no history for XLRE). Would the
CAPE index turn again to a non-Select Sector SPDR? Also, as happened with XLF, the history for XLK will no longer precisely represent the new XLK after communications companies are carved out.
DSENX in turn will need derivatives that track whatever index or indexes the
CAPE index chooses to track. Will they exist?
And they say that a machine can run an index fund.