I recommend my friend to use Manager for his Gold Retail business.
Gold Business is not accounted by currency and instead is being accounted by the weight of the Gold, even if you have 100s different products.
When someone start a Gold business they would calculate the capital by the weight of the Gold not the cost.
Gain/loss is being measured by calculating increase/decrease of the Gold itself; for example if the starting capital is 10 Kilo of Gold and after one year the available Gold is 12 Kilo, then the profit is 2 Kilo of Gold.
Of course there is money involved, for Gold Manufactures, Operation Expenses, sales.
So the question is, is it possible to know the total weight of all inventory Gold products?
This is how he explained it to me, I hope it is clear enough?