The money type stores a currency amount with a fixed
    fractional precision; see Table 8.3.  The fractional precision is
    determined by the database's lc_monetary setting.
    The range shown in the table assumes there are two fractional digits.
    Input is accepted in a variety of formats, including integer and
    floating-point literals, as well as typical
    currency formatting, such as '$1,000.00'.
    Output is generally in the latter form but depends on the locale.
   
Table 8.3. Monetary Types
| Name | Storage Size | Description | Range | 
|---|---|---|---|
| money | 8 bytes | currency amount | -92233720368547758.08 to +92233720368547758.07 | 
    Since the output of this data type is locale-sensitive, it might not
    work to load money data into a database that has a different
    setting of lc_monetary.  To avoid problems, before
    restoring a dump into a new database make sure lc_monetary has
    the same or equivalent value as in the database that was dumped.
   
    Values of the numeric, int, and
    bigint data types can be cast to money.
    Conversion from the real and double precision
    data types can be done by casting to numeric first, for
    example:
SELECT '12.34'::float8::numeric::money;
However, this is not recommended. Floating point numbers should not be used to handle money due to the potential for rounding errors.
    A money value can be cast to numeric without
    loss of precision. Conversion to other types could potentially lose
    precision, and must also be done in two stages:
SELECT '52093.89'::money::numeric::float8;
    Division of a money value by an integer value is performed
    with truncation of the fractional part towards zero.  To get a rounded
    result, divide by a floating-point value, or cast the money
    value to numeric before dividing and back to money
    afterwards.  (The latter is preferable to avoid risking precision loss.)
    When a money value is divided by another money
    value, the result is double precision (i.e., a pure number,
    not money); the currency units cancel each other out in the division.