From the ABC:
For the past week food has been hard to come by in Zimbabwe's shops.
A Government order for businesses to halve prices emptied most shelves within hours.
Since then basic food items have only been available on the black market at prices that are out of reach of most people.
Mr Tsvangirai has warned of an impending humanitarian crisis.
"It's very difficult to assess, but I think it's just a struggle for survival on a daily basis," he said.
"There's no bread, there's no salt, sugar, all those basics. And this has happened just over this last week."