You are right. Shops holding stock is speculation in a minor form. If they hold enough stock to last a certain period of time, and have built up stock based on measured rates of trade, it is low risk speculation.
If a shop keeper buys in bulk to get a better price, then the cost efficiencies (savings) give a better projected profit, but if tastes change, and the stock cannot be sold, e.g. some consumer electronics products drop so fast in value that holding stock will damage your profit, or give you a loss, so yes it is speculation.
Notice I say "projected" profit.
If the Asian financial crisis was to a large part caused by the property speculation in the 90s, how many more times does it have to happen before we learn from it?
In the 80 and 90s, just in time (JIT) and lean manufacturing became prominent to cut inventories, to stop capital being needlessly held as stock, either as a risk of damage/loss, or so that the capital could be freed up to use else where more efficiently to increase revenues, to invest in (speculate) and increase profit.
When I say the rich, I mean anyone managing or controlling the huge swathes of cash that exist in the system. The money exists somewhere surely! If there are companies that hold cash, or banks looking to invest cash - like those Icelandic ones, who had the pensions of several local authorities.
If that money is in pension funds, and rich individuals, i.e. those of us who don't have to work every day of our life (to survive) until we die - the poor are those that do, is the problem really a mismanagement of the world economy on a large scale?
Governments supporting speculation that actually backfires at a later date?
Are we just saving capitalism from the capitalists or are we really beginning to recognise that capitalism (the system of money in which we operate, supported by governments and the population in every country) could be reconfigured (regulated) to ensure that the ones controlling the money (the rich) do less damage to everyone or everything else (the poor, the environment etc etc etc), including the capitalist system itself, which enables efficient wealth creation if used appropriately.