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In this text, however, we will retain the minus sign in reporting price elasticity of demand and will say the absolute value of the price elasticity of demand when that is what we are describing

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However, it seems biologically implausible that the effect of smoking on weight gain can be modified by educational level, and therefore there is no reason to believe that the results observed are not valid.32 Moreover, the study has some strengths, such as the prospective design, the prolonged follow-up time and the availability of validation studies

While the causal pathways are not clearly understood and there is some evidence to support multiple pathways, the strong association between mental illness and smoking, and the common long-term persistence of both smoking and mental illness, suggest the value in responding to both problems in a co-ordinated way [57, 58]