Income level management

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The introduction, like the preface, is by the author. However, here
the author tells the reader what the book is about and how it should
or might be used. For example, the author might indicate that
experienced readers should begin with section two or that it is
better to read the work through before attempting the exercises. If
this is a second or subsequent edition, this is where the author will
explain the changes and improvements.
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