One thousand down today, two thousand up tomorrow

As a semi-retired person, I watch the total value of my retirement funds carefully. A good portion of my funds is invested in the stock market. So, everyday I see its value fluctuate up or down , often in thousands. Yesterday, I got the bill for my wife’s recent hospital stay, which came to thousands of dollars. It did not faze me. It only felt like a single bad day in the market!