Revenue by online and offline retailers gained 8.2 percent in September from a year earlier, according to the Ministry of Trade, Industry and Energy.
Revenue by online retailers surged 14.5 percent last month as the COVID-19 resurgence encouraged people to buy food and other daily supplies in the cyberspace.
The country's daily number of confirmed COVID-19 cases has hovered above 1,000 since July 7.
The government maintained its toughest social-distancing rules in the Seoul metropolitan area, roiling the consumer spending in offline stores.
Revenue by offline retailers rose 3.3 percent in September from a year earlier.
Sale by department stores jumped 24.3 percent on strong demand for luxury items, but revenue by discount outlets declined 13.3 percent last month.
Revenue by convenient stores increased 9 percent on higher demand for liquor and daily necessities.
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