The demand for housing is characterized by a regular pattern of increasing to a peak, then falling. when the demand reaches a low point, it then repeats the pattern. this pattern usually takes place over a three- to five-year period. this is an example of which type of demand pattern?

a) autocorrelation
b) step change
c) trend
d) seasonality and cycles

On december 31 of the current year, the unadjusted trial balance of a company using the percent of receivables method to estimate bad debt included the following: accounts receivable, debit balance of $97,900; allowance for doubtful accounts, credit balance of $1,031. what amount should be debited to bad debts expense, assuming 6% of outstanding accounts receivable at the end of the current year are estimated to be uncollectible?