Quote from cvds16:
there exists no such thing as a PPT !
Santa, the Easter Bunny, the Good Tooth fairy, Peace on earth, beneign inflation, full employment, and eternal youth don't, but the PPT does.
Enacted in March 1988. Seen the legislation. Covert. Curbs (explicit to appease the public) introduced roughly the same time.
But PPT is not performed the way suggested. Not sustained. To use a rough analogy, like the governor on the air compressor of a large truck. Cuts in at 90 PSI, cuts out at 125 PSI. Exclusively futures. Which implies large, liquid, indiscriminate, and for the most part NYSE stocks.
What's neglected to be mentioned is the PROGRAM trades that kick in on its coat tails at any hint of PPT. Impacts more issues.
I haven't seen TRIN turn on a dime often. Less than once a quarter. But it does. Generally early afternoon.