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This is the third paper in a series of our studies on the economics of criminal behaviour, specially written for the quarterly conferences of the Institute of Knowledge Management. The paper theoretically relies on the theoretical postulates of the famous economist, Nobel laureate Milton Friedman. According to Friedman, drugs are a tragedy for addicts. But criminalizing their use converts that tragedy into a disaster for society and for users. He argued that legalizing drugs would simultaneously reduce the amount of crime and raise the quality of law enforcement. Drug prohibition is a paradox reminiscent of the alcololic interdiction in the States (1920-1933). The main goal of the paper is to determine whether and to what extent the liberalization of the drug market affects the reduction of crime. In addition to the mentioned variable, the level of education of the working-age population and the median equivalised net income of citizens are included as control variables in the calculation model. The sample included 11 European countries: The Netherlands, Portugal, Poland, The Czech Republic, Spain, Italy, Finland, Denmark, France, Serbia and Belgium. The criterion for the country selection was the degree of drug market legalization, based on an insight into national laws. The authors defined four levels for measuring the level of drug liberalization. In the methodological sense, the authors used the econometric method. The crime was measured using the EuroStat indicator "Unlawful Acts Involving Controlled Drugs or Precursors", including unlawful handling, possession, purchase, use, trafficking, cultivation or production of controlled drugs or precursors for personal consumption and for non-personal consumption. In order to analyse the impact of drug market liberalization, education and net income on crime, a regression model was set up. Based on the results, for the case of tertiary educated, a set of 3 predictor variables explains 85.9% of the variability of criminal. Based on statistical significance, the variable liberalization of the drug market had the greatest impact on crime reduction. When this variable jumps by one point, crime falls by -117.749. In the case of low-educated citizens, the value of 82.9% of crime variability was explained by a set of 3 predictors. As for statistical significance, when the drug market liberalization increases by 1 point, crime decreases by - 110.915. In the case, when the net income increases by one point, the criminal increases by 0.014. A statistically significant influence of income on the growth of crime is noticeable, which was not present in the case of tertiary educated citizens. In both cases, the significant impact of drug liberalization on the reduction of crime is common.
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