Bradys Bentleys is a worldwide dealer of luxury vehicles. Brady hires you as an intern to help him make better decisions on how many Bentleys he might sell next month. He provides you with the data on the prior six months of unit sales.

Month	Unit Sales
1	100
2	200
3	300
4	400
5	500
6	600
7	???

9. Why are the moving average methods doing a poor job of predicting unit sales in the past?