Perhaps helps to think of i-AIM in stock purchase power of cash terms. Share price 10, falls to 8, then former 500 stock purchase power of cash rises by 10/8 x 500 = 625. That's up so AIM perhaps indicates to sell (reduce) some of that stock purchase power (reduce cash to buy more shares) .... etc.
I fog over pretty quickly trying to track that trade activity however. Seems like a milder form of AIM. You wont run out of cash, could run out of shares to sell, somewhat like a Ben Graham hold 50/50 stock/bonds varying between 25/75 and 75/25 according to valuations ... but potentially hitting 0/100 stock/cash.
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