The Weighted Aggregate Price Index. Suppose the manager of Disco is not satisfied with un weighted price indexes, because Volunteer sales are much higher than sales of Magnum or Sanko. The manager wants a price index that takes into account the importanceo price changes as measured by the quantities sold. ADVERTISEMENTS: In this article we will discuss about:- 1. Meaning of Index Numbers 2. Features of Index Numbers 3. Steps or Problems in the Construction 4. Construction of Price Index Numbers (Formula and Examples) 5. Difficulties in Measuring Changes in Value of Money 6. Types of Index Numbers 7. Importance 8. Limitations. Meaning of Index […] A thematic index is designed to follow a generally-accepted investment theme rather than a particular country, sector, or market segment. An example is an index comprised of companies listed in developed markets such as the UK and US that derive significant revenue from emerging markets.