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The network statistics and structures are examined and shown to be similar to those of a nationwide production network. Specifically, the bowtie analysis indicates what we refer to as a \u201cwalnut\u201d structure with core and upstream\/downstream components. To quantify the location of an individual account in the network, we used the Hodge decomposition method and found that the Hodge potential of the account has a significant correlation to its position in the bowtie structure as well as to its net flow of incoming and outgoing money and links, namely the net demand\/supply of individual accounts. In addition, we used non-negative matrix factorization to identify important factors underlying the entire flow of money; it can be interpreted that these factors are associated with regional economic activities. One factor has a feature whereby the remittance source is localized to the largest city in the region, while the destination is scattered. The other factors correspond to the economic activities specific to different local places. This study serves as a basis for further investigation on the relationship between money flow and economic activities of firms.<\/jats:p>","DOI":"10.1140\/epjds\/s13688-021-00274-x","type":"journal-article","created":{"date-parts":[[2021,4,21]],"date-time":"2021-04-21T11:27:30Z","timestamp":1619004450000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Money flow network among firms\u2019 accounts in a regional bank of Japan"],"prefix":"10.1140","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5099-8169","authenticated-orcid":false,"given":"Yoshi","family":"Fujiwara","sequence":"first","affiliation":[]},{"given":"Hiroyasu","family":"Inoue","sequence":"additional","affiliation":[]},{"given":"Takayuki","family":"Yamaguchi","sequence":"additional","affiliation":[]},{"given":"Hideaki","family":"Aoyama","sequence":"additional","affiliation":[]},{"given":"Takuma","family":"Tanaka","sequence":"additional","affiliation":[]},{"given":"Kentaro","family":"Kikuchi","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2021,4,21]]},"reference":[{"key":"274_CR1","unstructured":"Bank of Japan Guide to Japan\u2019s flow of funds accounts. https:\/\/www.boj.or.jp\/en\/statistics\/. 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