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Estimate price cross-elasticities of demand

When the prices rise of Comfort shoes rise through two percent, causing Wonder sock sales to fall through six percent, these goods are _____, and _____ is about the cross price elasticity of demand. (1) luxuries;  6. (2) necessities; 2. (3) substitutes; 3. (4) complements;  3.

I need a good answer on the topic of Economics problems. Please give me your suggestion for the same by using above options.

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