At 07:00 (AEST), the Australian dollar was buying 77.24 U.S. cents, down from 77.58 U.S. cents on Friday.
"Markets closed the week on a soft note amid rising Covid infections and obstacles to U.S. fiscal stimulus," Westpac Bank economists said in a morning note.
"Equities fell modestly, the defensive U.S. dollar rose slightly and commodities were under pressure."
At 09:30 (AEST), the local unit was buying 77.11 U.S. cents.
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