Table 1. Input and output variables of the URBAN model.

Symbol	Variable name	Values	Symbol	Variable name	Values
	Input		X6	Initial # of stores	20
X1	Preference for store	0~6, step 0.25	X7	Initial # of people	200
X2	Preference for travel	0~6, step 0.25		Output
X3	$ amount of purchase	N (100, 20)	Y1	Final number of stores	N/A
X4	Store operating cost per day	N (0.01,0.001)	Y2	Total walking distance	N/A
X5	Urban space size	50*50 gird where a grid cell equals 1002 square feet	Y3	Total driving distance	N/A