Linked from
The 10 pages that link to Purchasing power, each with the reason it gives.
Food securityRelated: Households may face hunger when food costs rise faster than their resources.
HyperinflationRelated: Its rapid decline is the defining everyday consequence of hyperinflation.
Cost of livingRelated: It shows what a given income can actually afford at local prices.
Pound sterlingRelated: Sterling’s purchasing power changes with prices and exchange rates.