In the case of perfect multicollinearity,OLS is unable to estimate the slope coefficients of the variables involved.Assume that you have included both X1 and X2 as explanatory variables,and that X2 = X 
,so that there is an exact relationship between two explanatory variables.Does this pose a problem for estimation?
Definitions:
Allowance for Doubtful Accounts
An estimate of the amount of credit sales that are expected to become uncollectible, used to adjust accounts receivable to its net realizable value.
Bad Debt Expense
This represents the estimate of non-collectible accounts receivable that occurs in a given period, reflecting potential losses due to credit sales.
Credit Sales
Sales transactions where the payment is delayed as opposed to immediate cash payment, generating accounts receivable.
Adjusting Entry
An accounting journal entry made at the end of an accounting period to allocate income and expenditures to the period in which they actually occurred.
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