C. Forecasting and other supply chain activities A recent report produced by Shop n Pay's chief demand planner has revealed that the retailer's reliance on simple exponential smoothing to forecast demand for its products is partly responsible for the significant bullwhip effect in the supply chain and the stock outs in the past few years. In this regard, the chief demand planner is recommending that exponential smoothing with trend adjustment (Holt's Model) should be used to forecast demand for aggregate planning for the 2020 fiscal year. Mr Msimanga has retrieved from the retailer's database the following information on number of goods sold over a two-year period. Year Jan 2018 650 2019 750 Monthly sales ('000 units) Jun Jul Aug Sep 840 930 630 860 680 950 1080 742 920 Feb Mar Apr May 700 820 850 700 800 900 920 Oct Nov Dec 1050 750 1100 820 600 705