For both, removal of liquid assets (I assume you mean cash/currency) would itself tank the value of that currency (same as selling off of stocks drops the value of that stock). Illiquid assets would need to be exclusively valued in fiat (e.g. government bonds/gilts mainly) to remain a backing for that fiat, otherwise the asset could equally be valued in another currency (e.g. your UK property could be valued at £250,000 but you could sell it for 5840 tons of coal if you wanted) if that fiat tanked. This exact situation has been observed in cases of hyperinflation.