Precisely predicting the effect of economic prosperity upon the demand for mass transit would be excellent facilitated by a good calculates approximately of the: (w) slope of the demand curve for mass transit. (x) price elasticity of demand for mass transit. (y) price cross-elasticity of demand between other goods and mass transit. (z) income elasticity of demand for mass transit.
Please choose the right answer from above...I want your suggestion for the same.