BEIJING—The Shanghai government will support companies applying for approval to sell duty-free goods, and encourage duty-free shops to be set up at airports, hotels, malls and other commercial venues, municipal authorities said. The development of a “duty-free economy,” which will encourage spending on imported products, including heavily-taxed luxury goods, was outlined in a 2021–2025 consumption plan released on Saturday. Presently, duty-free spending in China is largely concentrated in the southern island province of Hainan, where the annual limit on individual duty-free spending was hiked to $15,467 last year from a previous limit of $4,640. Tariffs on imported consumer goods vary in China, with taxes on some luxury items such as perfumes and watches exceeding 30 percent. Lured by the substantially lower prices, millions of domestic tourists flock to Hainan’s malls each year, and the numbers have been boosted by restrictions on overseas travel resulting from the COVID-19 pandemic. Otherwise, there …