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This article describes the findings of Lanre Kassim of the University of Kent, who has found out that the trade liberalisation of economies in sub-Saharan African countries has not been able to affect the YED of imports and exports, meaning that trade liberalisation has not significantly changed the rate of change of income in these countries. However, Kassim states that PED of exports and imports has increased, and thus a significant change in demand can be recognised, however little the change in total income may remain.

This article talks about how shoppers change their spending habits during the recession in America. 83% of survey respondents say that price is a major factors. They have taken different steps in cutting back on elastic goods like: Switching grocery stores, buying less clothes or not branded clothes. However, shoppers did not cut back on certain goods like meat and seafood, milk, coffee, and alcohol. That is because they are necessary inelastic goods. So even with a lower Income elasticity, people still have to buy inelastic goods.

This article describes the launch plans and the Xbox marketing chief's opinions on the profits made shortly after the launch in late November. He sais that even though all pre-orders have been sold out, due to the production, marketing, and development costs, there will be a very low margin at first. So even though the demand is very high, the price and supply are to inelastic to provide a higher margin for Microsoft.