There is a very linear relationship between the maximum concentration that your bacterial culture will get to and the amount of sugar/carbon that they have to eat. Log growth is not really sustainable.
(Unless you continuously find ways to unlock new energy sources, either by luck or because you set aside resources for research/generation of diversity.)
For markets, it would be also good to mention that the price of an asset is not necessarily tied to the value of the asset, and this made worse by markets of low or unknown liquidity. And I would guess that it's also made worse when the valuation of group of assets is calculated by extrapolating from the price of a small number of units of the same kind of asset (i.e. stocks).