After a law was introduced by the government banning smoking in public enclosed places, scientists have noticed a large decrease of child asthma cases; in the first year, the number of admissions in hospital with this case decreased by 12.3%. This shows that before the ban, smoking was causing a negative externality, which was child asthma. This therefore meant the government needed to intervene, by creating the smoking ban on public places.

This article concerns the price ceiling set on milk products. The government did this because milk industries were raising the price of milk products for children under 6 years old. It is hoped that this will stabilise the prices of milk.

This article concerns the excise tax place on beverages containing sugar. Berkeley has done this to reduce the amount of consumption of the drink, which they hope will improve nutrition and health in the area. This shows that the beverage is elastic, and the government are controlling its demand.

This article concerns the elasticity of oil supply falling due to the time it takes to acquire it and the difficulty to get it. More oil wells are needed and therefore makes the supply extremely slow because of the time it takes to drill. Because of this, the oil supply takes a long time to react to price change in the economy, making it less and less elastic.

The price of cigarettes has been radically increased in Australia as the mortality rate of smokers has become extremely worrying. This relates to this week's topics because it shows how raising the cigarette price in such a radical way will decrease the demand, which is the aim of health services. The PED of the cigarette is therefore elastic, as it will lower the demand more than the % change in price because it is such a large leap of price.

This article concerns the climate change and what it could cause for the country, which includes water and food shortages. These are affected by the climate damaging the crop production. This is relevant with this week's topic because the supply of agricultural food is decreasing, therefore causing the prices to rise. This rise in price therefore helps the allocation of the food, which is a serious impact on the country.

Price of gold is increasing as demand for it is increasing in Asia. This article relates to this week's topic because it demonstrates that as demand of gold is rising, its price must increase because it is a limited source and therefore there can only be a limited amount of people who acquire it - therefore, according to this article, the gold is being allocated to people who are ready to spend $1,400 an ounce .