an embargo from Arab countries, created shortage
The U.S.A. and Mexico are countries that Canada exports its lumber to.
It's rumored that the bee shortage was caused by a pesticide. People were killing off bees instead of repelling them.
they import it from other countries
somalia
It caused a labor shortage
shortage of water
There was no manpower shortage, it was just that the Germanic peoples who flooded in from Eurasia greatly outnumbered the Romans.
drought
Human activities and drought are some of the factors that caused the Delta Smelt cause a water shortage.
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shortage of money which is ultimately caused by Politics!