A number of factors determine the elasticity:
Substitutes product : The more substitutes, the higher the elasticity, as people can easily switch from one good to another if a minor price change is made
Percentage of income: The higher the percentage that the product's price is of the consumers income, the higher the elasticity, as people will be careful with purchasing the good because of its cost
Necessity: The more necessary a good is, the lower the elasticity, as people will buy it no matter the price, such as insulin
Time: The longer a price change holds, the higher the elasticity, as more and more people will stop demanding the good (i.e. if you go to the supermarket and find that blueberries have doubled in price, you'll buy it because you need it this time, but next time you won't, unless the price drops back down again)
Breadth of definition: The broader the definition, the lower the elasticity. For example, Company X's fried dumplings will have a relatively high elasticity, where as food in general will have an extremely low elasticity
In this project, we will study the cross-price