What can a financial institution frequently do for a deficit economic unit (DEU) which it would have complexity doing for itself if the DEU were to deal directly with an SEU?
SEUs typically desire to supply a small amount of funds, while DEUs typically desires to attain a large amount of funds. Therefore it is frequently difficult for surplus and deficit economic units to come together on their own to arrange mutually beneficial exchange of funds for securities. A financial institution can step in & save the day. A bank, savings & loan, or insurance company can take into small amounts of funds from several individuals, form a large pool of funds, and then utilizes that large pool to purchase securities from individual businesses and governments. (It is just one example of the beneficial things financial institutions do for DEUs)