The use of the poverty line of $1 a day had long come under criticism for seeming arbitrary and using poor quality and limited data thus risking an underestimate of poverty. The $1.25 a day level is accompanied with some additional explanations and reasoning, including that it is a common level found amongst the poorest countries, and that $2.50 represents a typical poverty level amongst many more developing countries.
As interest rates have been going down over the past 30 years, bond prices have continued to go up. With the 10-year yield (risk free rate) at roughly 2.55%, and the Fed Funds rate at 1.5% (two more 0.25% hikes are expected in 2018), it’s hard to see interest rates declining much further. That said, long term interest rates can stay low for a long time. Just look at Japanese interest rates, which are negative (inflation is higher than nominal interest rate).
An obvious example is over exposure to bank stocks, which have been excellent investments for over a century.  Though a foundation of most portfolios, bank stocks do involve more risk at certain stages of the economic cycle than many realise.  Being less exposed to bank shares in the last few months could have preserved some capital.  So, a more diversified approach can help mitigate some of these risks.