The main goal of this paper is to show the influence of the economic growth, i.e. growth of GDP on happiness of the population and its general impact on national economy. The difference between economic growth and economic development is in the size of the terms they describe. Economic growth is just one of the variables of national economy which has an influence on economic development, alongside inflation, unemployment and fluctuations of the course that have been described in this paper. Also, the movement of the economic variables has been shown over the last fifteen years to get a clearer image because this period includes a time before, during and after an economic crisis which hit the country. Economic crises had started in the year of 2008 and in this paper work we have shown an exit from the economic crisis by one of the methods of calculation of GDP while the other methods were described in theory. Since the main goal of this paper is an influence on happiness of the population the terms of population and happiness have been described. Population can be either source or an obstacle for the economic growth depending on the economic situation in the country. By GDP standards of EU, Republic of Croatia is at the bottom, but by HPI which measures the happiness of the population is positioned above the developed countries of the European Union. A comparison was made because of this reason with Germany and the parameters that make Croatian population happier than German population have been described. In the work example an empirical study was conducted on the impact on the happiness of the population through the social networks which is presented in this paper.