What is meaning of budgetary slack ?

Budgetary slack can take one of two forms: It can either underestimate the amount of income or revenue that will come in over a given amount of time, or overestimate the expenses that are to be paid out over the same time period. 

This strategy effectively prevents budgets from working properly.

 

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When a budget is easily achieved it is said to have budgetary slack in it When budgetary slack exists either revenue are understand or expenses are overstated to which makes it difficult to properly evaluate the performance

Budgetary slack is the process of making the target easy to achieve by under estimste the revenues and over estimate the expenses, i could avioded or mitigated by using the ZBB zero based budget.