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Multipliers, linkages and influence fields among the sectors of the Portuguese maritime cluster
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The main objective of this paper is to present the multiplier effects on the Portuguese economy of the main maritime sectors and their comparison with other economic sectors, in particular the key activities of which they are suppliers or buyers. One way of evaluating economic activities, which is adopted in this paper, is through the sectorial linkage indices and their interdependence, displaying their direct, indirect and induced effects, which can be quantified with the use of the Leontief (input-output) matrix. Based on the input-output matrix, one obtains the interconnection coefficients, the multiplying factors and the influence fields. Based on the values of the interdependence coefficients, the economic activities are analyzed and classified by its importance to the national economy. The paper identifies a broadly diversified productive structure, with several key sectors, which, if stimulated, can significantly boost the growth of other sectors and the overall economy.