(Figure: VI) The price of good Y increased from $1.00 to $5.00. 
a. Explain whether goods X and Y are complements or substitutes.
b. Calculate the cross-price elasticity of demand for good X with respect to good Y.
c. What happened to the demand curve for good X?
Definitions:
Signed
Used to indicate whether a numerical value is positive or negative.
Earth Summit
A global conference focused on environmental policy and sustainable development held by the United Nations.
Environmentalist
An individual who advocates for or works towards protecting the natural environment from degradation and promoting sustainability.
Rio De Janeiro
A major city in Brazil, known for its Copacabana and Ipanema beaches, the 38m Christ the Redeemer statue atop Mount Corcovado, and its carnival festival.
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