It's called PE contraction - a lower profit (hence, EPS) results in a lower PER being accorded to the stock. Hence the recent 50% sp fall vs 16% drop in EPS.
Reverse will start happening if (when imo) MPG starts delivering on its forecast of a better result next year.
You can already see it in action today - MPG delivered on its downgraded forecast of 8.8 eps and the sp is up 7c, meaning a higher PER.
If (when imo) MPG delivers 10.5c next year, the sp will track higher - I believe a PER then of 12 so sp could be $1.26.
Happy holder.
Always right to buy at 82c. :D