The indicators of agglomeration in urban and regional economies can be broadly classified into specialization and diversity, each of which is called the Marshal-Arrow-Romer type and the Jacobs type as external economic effects. There is also a Porter-type competitive environment indicator that advocates cluster-like agglomeration. The（modified）specialization coefficient, the Hirshman-Halfindahl index, and the entropy index are examples of indices that directly measure these factors. This paper reviews and evaluates indicators related to urban and regional economic agglomeration developed by Nakamura（2008）and Nakamura（2009）, as well as indicators directly and indirectly related to agglomeration that have been developed since then. rice field
