Value was making value as you put it, long before rapid trading. Speculation and arbitrage are like the first two things that develop in any economy. Any entrepreneurial grade school child trading candy, baseball cards, pogs, hotwheels, or whatever the hot new thing is has probably seen both first hand.
Have you checked your blood pressure lately? Salt intake? Hydrating okay? Hormones? Allergies?
Could be an early warning sign of something more serious.
A little swelling and water retention especially on hot days is normal. But, if your shoes stop fitting due to a little water retention, they probably didn’t fit very well to begin with. It’s easier than you’d think to get used to shoes that are too small. Your feet adapt, but suffer.