why money datatype size returns with 2147483647 instead of 19,2

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From: bramesh(dot)ppl(at)gmail(dot)com
To: pgsql-docs(at)postgresql(dot)org
Subject: why money datatype size returns with 2147483647 instead of 19,2
Date: 2017-08-21 08:28:51
Message-ID: [email protected]
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Page: https://www.postgresql.org/docs/9.1/static/datatype-money.html
Description:

As per the documentation, the size of the money datatype is 19,2 but always
returning with 2147483647.

can you clarify on this?