Symbols and meanings.

Table 1: Symbols and meanings.

Type	Symbol	Meaning	Symbol	Meaning
Parameter	L	Distance between merchants	$R_{i}$	Meal quality valuation (i: A or B)
	$τ$	Basic ratio of commission	$λ$	Add-on commission ratio
	$θ$	Time cost per unit	$x$	Location coordinates for consumer
Decision Variable	$p_{i}$	Order price for merchant i
Intermediate Variable	$π_{i}$	Profit for merchant i		Platform commission
	$U_{i}$	Consumer utility	$Δ T$	Trust advantage for merchant A
	$D_{i}$	Quantity demanded for merchant i	$d^{*}$	Equilibrium-point position coordinates