17608
An econometric analysis was applied to the data , and the reinforcing strength of cocaine was measured by examining consumption ( i . e . quantity demanded ) and elasticity of demand as a function of price , which was manipulated by varying the dose and ratio requirements on a fixed ratio schedule of reinforcement .
 Chemical: cocaine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: cocaine