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Apart from trading in goods, newer forms of goods exchange have arisen from the second-hand market to meet people's diversified demands, including recycling, donations, borrowing and old-for-new barter.

Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, said at the White House briefing on Saturday that there was no "definitive information to be able to make any comment" on whether hydroxychloroquine can be effective in treating the novel coronavirus.

Apart from buying cut-price goods, the group also sell items they no longer need on online second-hand markets. Statistics show that half of the female Zhuanzhuan users under the age of 24 have sold unused goods on the platform.

Anthony Thomas, a farmer, carries a dog at his uncle's property destroyed by bushfires in Kiah, Australia, on Wednesday. TRACEY NEARMY/REUTERS

Annamaria Lusardi, chair of the financial literacy expert group that designed the financial literacy portion of the assessment, said that it was "critically important" to measure students' financial skills.