The Petrol Retailers Associationn said only panic buying would cause shortages.
They say companies cause shortages on purpose, holding products off the market to push up prices.
Alarm is growing that an expected fall in American grain exports could cause shortages and further increases in prices worldwide.
As a result, production lines are stretched to the limit and any glitch can quickly cause shortages.
Trade links are broken immediately and cause shortages.
A fast decline of the labour force will cause shortages and a rapid increase in wages.
Some just won't think its worth the money to have to worry about their ship, which could cause shortages on the supply side.
Intermittent drought events regularly cause shortages in range resources in semi-arid lands of East Africa (Kaimba et al. 2011; Njiru 2012).
This was widely expected to cause shortages in worldwide markets for computer memory chips, with back orders piling up until Taiwan's production flow could return to normal.
This measure must be used with care, as it may cause shortages of doctors in other countries.
