Parameter
${\mathit{ge}}_{\mathit{md}}$	Transportation distance (km) from manufacturer m to distribution center d
${\mathit{dr}}_{\mathit{dr}}$	Transportation distance (km) from distribution center d to store r
${\mathit{hc}}_{\mathit{rc}}$	Transportation distance (km) from store r to region c
${\mathit{tcg}}_{\mathit{mdjv}}$	Preventive cost of health protocols and transportation cost per kilometer for product j from manufacturer m to distribution center d by vehicle v
${\mathit{tca}}_{\mathit{drjv}}$	Preventive cost of health protocols and transportation cost per kilometer for product j from distribution center d to store r by vehicle v
${\mathit{tc}}_{\mathit{rcjv}}$	Preventive cost of health protocols and transportation cost as unit per kilometer for product j from store r to region c by vehicle v
$p_{\mathit{mj}}$	Cost of supply and purchase of product j from supplier m
${\mathit{ca}}_{\mathit{aj}}$	Cost of water consumption and disinfection of product j by disinfection and sterilization center a
${\mathit{GP}}_j$	Production of sanitary wastes in product disinfection j
${\mathit{CGP}}_j$	Cost of collection and disposal of sanitary wastes for the product j
$o_{\mathit{mj}}$	Maximum production capacity, manufacturer m for product j
${\mathit{vg}}_{\mathit{dj}}$	Maximum capacity of distribution center d for product j
${\mathit{va}}_{\mathit{aj}}$	Maximum disinfection and sterilization capacity of disinfection and sterilization center a for product j
$u_{\mathit{rj}}$	Maximum retail supply capacity r for product j
$b_v$	Maximum vehicle capacity v
$s_v$	Maximum vehicle speed v
${\mathit{cv}}_v$	Fixed cost of purchasing a vehicle v
${\mathit{eg}}_d$	Fixed cost of construction of distribution center d
${\mathit{ea}}_a$	Fixed cost of construction of a disinfection and sterilization center a
$e_r$	Fixed cost of construction of a retail center r
${\mathit{ccp}}_v$	Carbon emission costs due to transportation by vehicle v per kilometer
${\mathit{cco}}_j$	Operating carbon emission costs for the product j
${\mathit{CD}}_j$	Delay cost of delivery of product j
${\mathit{EDM}}_{\mathit{mdj}}$	Expected time of delivery of product j from manufacturer m to distribution centers d
${\mathit{EDG}}_{\mathit{drj}}$	Expected time to delivery product j from distribution center d to store r
${\mathit{EDR}}_{\mathit{daj}}$	Disinfection time of product j in distribution center d in disinfection and sterilization center a
${\mathit{EDA}}_{\mathit{arj}}$	Expected time to delivery product j from disinfection and sterilization center a to store r
${\mathit{ERC}}_{\mathit{rcj}}$	Expected time to delivery product j from store r to region c in online sales
${\mathit{LG}}_{\mathit{md}}$	It is equal to 1 if delivery from manufacturer m to distribution center d is allowed, otherwise it is 0
${\mathit{LA}}_{\mathit{dr}}$	It is equal to 1 if delivery from distribution center d to store r is allowed, otherwise it is 0
${\mathit{LB}}_{\mathit{da}}$	It is equal to 1 if the disinfection center a in warehouse d is active, otherwise it is 0
${\mathit{LC}}_{\mathit{ar}}$	It is equal to 1 if delivery from disinfection center a to store r is allowed, otherwise it is 0
${\mathit{LE}}_{\mathit{rc}}$	It is equal to 1 if delivery from store r to region c is allowed, otherwise it is 0
${P\omega }_{\mathit{jc}}$	In-person purchase market elasticity for product demand j in region c
${E\omega }_{\mathit{jc}}$	Online shopping market elasticity for the demand of product j in region c
${\omega }_{\mathit{jc}}$	The rate of change in the purchase of product j in region c due to the COVID-19 pandemic
${\partial }_c$	COVID-19 pandemic status in region c (range 0 to 1)
${\sigma }_j$	Price significance coefficient on in-person demand of product j
${\delta }_j$	Coefficient of price importance on online demand of product j
$\alpha$	Percentage of tolerance that the price of in-person sales of a product can differ from the cost of supply
$\beta$	Percentage tolerance that the price of the online sales of a product can differ from the cost of supply
$\mathit{BM}$	Big number