Society A book for part-time and part-time workers that does not lose money by "the wall of annual income" Culture

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TJMOOK / Must read for part-time and part-time workers! This book gives you a quick and easy idea of the "Annual Income Barrier" that is too complex to know in order not to lose money! It is said that as many as 60% of non-regular workers are on a "work-abstention" policy to adjust their working hours so as not to reduce their net income. Among the "○ ten thousand Barriers", what is their own wall, how much annual income they will not lose, and tips for reevaluating themselves without being bound by the "Annual Income Barrier" and tips for reviewing how they work.