 Update: Unknown edit
 Affected period: 23–26 March 2012 (4 days)
 Affected items: All items
 Comment: Prices from 22 March 2012 shown throughout the affected period.
Adjustment method
To approximate the prices, the average of the closest known prices (22 March and 27 March) is used. The formula for the kth missing price is as follows:
 $ {p}_{\text{k}} = {p}_{\text{start}} + \frac{{p}_{\text{end}}  {p}_{\text{start}}}{({d}_{\text{end} \to \text{start}})} \times ({d}_{\text{k} \to \text{start}}) $
For example, if the price for Item A is 331 coins on 22 March (P22) and 292 coins on 27 March (P27), then the price for 23 March (P23) would be:
 $ \begin{align} {p}_{\text{23}} &= {p}_{\text{22}} + \frac{{p}_{\text{27}}  {p}_{\text{22}}}{({d}_{\text{27} \to \text{22}})} \times ({d}_{\text{23} \to \text{22}}) \\ \\ &= 331 + \frac{292331}{5} \times 1 \\ \\ &= 323.2 = 323 \; \text{(rounded to nearest coin)} \end{align} $
And, the price for 24 March (P24) would be:
 $ \begin{align} {p}_{\text{24}} &= {p}_{\text{22}} + \frac{{p}_{\text{27}}  {p}_{\text{22}}}{({d}_{\text{27} \to \text{22}})} \times ({d}_{\text{24} \to \text{22}}) \\ \\ &= 331 + \frac{292331}{5} \times 2 \\ \\ &= 315.4 = 315 \; \text{(rounded to nearest coin)} \end{align} $
And so on. Thus, using the formula for the missing days, the approximate prices would be:
Date >  22 March  23 March  24 March  25 March  26 March  27 March

Item A (price)
 331 (actual)  323 (calculated)  315 (calculated)  308 (calculated)  300 (calculated)  292 (actual)

