Of course, to keep it simple, I have ignored the phenomena of...

Of course, to keep it simple, I have ignored the phenomena of unlimited circulation of shares between the market lizards made possible by regulators in the US and here whereby at least 50% (some experts say more than 60%) of all turnover never lands anywhere but is simply computers trading with each other hoping to cover their afternoon tea and biscuits (and/or executive bonuses, and/or friendly fees for work well done).

So you can probably slash my trading volumes by 50% to get the real number of shares that actually changed hands!