This Input-Output model depicts inter-industry relations of Hawaii’s economy. It shows how the output of one industry is an input to each other industry. A given input is enumerated in the column of an industry and its outputs are enumerated in its corresponding row. This format shows how dependent each industry is on all others in the economy both as customer of their outputs and as supplier of their inputs. Input-Output economics are used to study regional economies, and as a tool for economic planning. Indeed a main use of input-output analysis is for measuring the economic impacts of events as well as public investments. It is also used to identify economically related industry clusters and also so-called “key” or “target” industries–industries that are most likely to enhance the vitality of our economy.