Across Instruments

The ratio principle says the ladder reads the same on any instrument. Chapter 18 added the honest qualification: the ruler is the same, but the boxes it is drawn on are cut differently from one market to the next. This chapter goes through the four markets most readers trade — currencies, stocks, index futures, and crypto — and says, for each, how the box is cut, where the routine needs adjusting, and what the instrument does that the others do not.