Custody asset

Partly – but also the conflict of interest that arises. Imagine a business acquaintance asked you, for a fee, to take custody of some assets for three years while he goes abroad to work – a porsche, an apartment and a suitcase of cash. What could you do with them? Use the car, rent out the apartment, invest the cash … etc. Of course you would not do these things but the threat exists (what if you needed to drive someone to hospital urgently and the car happened to be the nearest mode of transport? or a distant relative turned up and you have nowhere to accommodate them at short notice? … etc)
Of course there are safeguards that can be put in place – keeping these assets separate from your own (so the cash doesn’t go into your bank account), if allowed to bank the cash then accounting for any interest your earn on it, etc.
If being a custodian of assets is part of a business (e.g. in purchasing property in the UK the buyer typically pays the solicitor who pays the seller) there will be laws and regulations also – but this is outside the scope of the AAA syllabus.