The composite consumer sentiment index (CCSI) stood at 70.8 in April, down 7.6 points from the previous month, according to the Bank of Korea (BOK).
It marked the lowest in over 11 years since the global financial crisis roiled the world economy in December 2008.
The index continued to decline this year from 104.2 in January to 96.9 in February and 78.4 in March each on worry about the coronavirus pandemic.
Consumers refrained from outside activities such as traveling, shopping and eating-out, hitting hard offline retailers.
Sub-indices lost ground. The CSI for current economic situations tumbled 7 points over the month to 31 in April, while the figure for prospective economic conditions slipped 3 points to 59. Those indices were the lowest in over 11 years.
The index for future household income reduced 4 points to 83 for this month, and the reading for future consumer spending retreated 6 points to 87.
Inflation expectations, which gauge outlook among consumers for headline inflation for the next 12 months, stood unchanged at 1.7 percent in April compared with the previous month.
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