Hong Kong government gave out consumption vouchers in 2021 to alleviate the economic recession. Explain, how the consumption voucher scheme could lead to inflation.

The only use of consumption voucher is consumption (that means individuals cannot save it in the bank or make investment from it). To avoid the loss of its value after the expiry date, rational individuals will thus spend with the consumption voucher on consumer goods to maximize their benefit. So, the aggregate demand will increase and the AD curve shifts to the right. The price level will increase, that is, inflation.