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every system of banking, whether that in which the reserve is kept in many banks, or one in which it is kept in a single bank only, there will always be a class of persons who examine more carefully than busy bankers can the nature of different securities; and who, by attending only to one class, come to be particularly well acquainted with that class. And as these specially qualified dealers can for the most part lend much more than their own capital, they will always be ready to borrow largely from bankers and others, and to deposit the securities which they know to be good as a pledge for the loan. They act thus as intermediaries between the borrowing public and the less qualified capitalist; knowing better than the ordinary capitalist which loans are better and which are worse, they borrow from him, and gain a profit by charging to the public more than they pay to him.

Many stock brokers transact such business