What you will learn
- Price versus return
- Nominal versus real measures
- Index construction basics
- Separate fact from explanation
Price versus return
A price is a level measured in units such as dollars per ounce. A return measures change relative to an investment or earlier price. Comparing a dollar price change in one instrument with a percentage return in another mixes quantities and can mislead.
Nominal versus real measures
Nominal measures use stated currency units; real measures adjust for a measure of purchasing power. An inflation adjustment depends on the index, dates and population represented. A nominal gain therefore does not automatically mean an equal improvement in purchasing power.
Index construction basics
An index summarizes a defined basket using a calculation methodology. Constituents, weights, rebalancing and currency denomination determine its meaning. Two indexes associated with the same broad theme can behave differently because their construction is different.
Separate fact from explanation
Separate observations from explanations. A statement that gold and the dollar both rose is an observation about specified data. Claiming that one caused the other requires additional evidence and consideration of common drivers, timing and alternative explanations.
Worked example
An illustrative price rises from 100 to 105: the price change is 5 and the simple return is 5%. A different price rises from 1,000 to 1,005: the same absolute change corresponds to 0.5%, so the moves are not equal in return terms.
Try it yourself
Calculate both percentage returns in the example. Write one purely descriptive statement about them and one causal claim that the data alone cannot support.
Show the worked solution
The returns are 5% and 0.5%. A valid description says the first percentage move was larger. The two observations alone cannot establish why either moved or that a trade in one caused the other.
Apply this to your course project
Draw an annotated map linking gold, currencies, rates and equities without claiming fixed correlations.
Keep the calculation inputs, assumptions and decisions with your work. Practical exercises are self-reviewed; the scored knowledge checks assess the questions shown, not an independent certification of practical competence.