Economics is complex, multilateral, alive science and art, at the same time, being part of our lives and highlighting the human activity, skills, knowledge in the core of all components of the economic and social system. This enterprise leads to a solid endogenous unity of Economics, unity achieved by interdisciplinary, osmotic overlap of system's components, proving that the whole is not, however, the sum of its parts. Unity in diversity, micro, macro, world levels, the mechanisms of functioning of the society and the diverse necessities to be satisfied, in a word a mix of Economics and Political Economy.