Cornerstone investor (so also said in German; more rarely basic investor)

A well-known person, company, or public entity-including various EU funds-that participates in an engagement and usually contributes, in addition to capital, intangibles such as market knowledge, contacts with foreign clients, business connections, or-as is especially the case with public-private partnerships-its prestige, good image, reputation. – See co-investment, end investor, financial investment, landmark building loan, multisourcing, assets, intangible.

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University Professor Dr. Gerhard Merk, Dipl.rer.pol., Dipl.rer.oec.
Professor Dr. Eckehard Krah, Dipl.rer.pol.
E-mail address: info@ekrah.com
https://de.wikipedia.org/wiki/Gerhard_Ernst_Merk
https://www.jung-stilling-gesellschaft.de/merk/
https://www.gerhardmerk.de/