A $1 coin now is worth 10 billion of the old dollars.
On Friday, about 20 $1-coins - or 200 billion Zimbabwe dollars - could buy a loaf of scarce bread if it could be found in a downtown supermarket. That's about $5 at the official rate and $2 at the black market rate that better reflects the value of the currency.
"It has been a chaotic day," said Farayi Chikomba, a teller filling plastic banking bags with coins at a small supermarket at closing time. "Customers have been digging out their old coins."
Lines built up as staff counted the coins.
"It's a bonus for anyone like me who didn't know what to do with coins and didn't throw them away," said businessman Frank Takavara, who carried a cookie jar full that bought him a small sachet of powdered milk.
Chikomba said he received a few new $10 and $20 notes issued by banks Friday. But most purchasers still used coins, old notes or checks. The old currency remains effective until December, being used alongside new bills in the "revalued" currency rate introduced Friday.
The biggest new bill is $500, equivalent to 5 trillion in the old denominations. Two weeks ago, the bank had introduced a $100 billion-dollar note.
Bank executives said many branches still were waiting for deliveries of new currency from the central bank late Friday, the first day of issue.
In setting prices on its menu, a downtown cafe mistakenly slashed nine zeros from its prices instead of the required 10. Until December, prices must be quoted in both new dollars and old dollars, according to a central bank directive.
"Everyone is totally confused. Maybe things will settle down in a few days. It's farcical at the moment," said the cafe manager, who asked not to be identified for fear of repercussions.
Embattled President Robert Mugabe blamed profiteers and Western sanctions for the economic chaos in the southern African nation and this week warned that if businesses tried to cash in on the mess, he would impose a state of emergency.
There were fears he could use emergency laws to punish rivals should power-sharing talks with the opposition not resolve in his favor.