The paper sets forth in detail categorically-algebraic or catalg foundations for the operations of taking the image and preimage of (fuzzy) sets called forward and backward powerset operators. Motivated by an open question of S. E. Rodabaugh, we construct a monad on the category of sets, the algebras of which generate the fixed-basis forward powerset operator of L. A. Zadeh. On the next step, w...

Tourism sector is one of the important sectors for countries in terms increasing employment opportunities, providing income economy and raising foreign currency earnings. Employing 2002 2012 input-output tables, aim this study to assess tourism Turkey with model. According results obtained, related are slightly above average among all other multipliers, output multipliers forward - backward lin...

Within the endogenous growth framework, we offer an explanation on how foreign direct investment (FDI) generates externalities in the form of technology transfer. We distinguish between the level and rate effects of spillovers on the productivity of domestic firms. A new insight gained from the theory is that the level and rate effects of spillovers can go in opposite directions. The negative l...