points (pts) is some kind of currency in HnH - i.e. 1 pearl q 10 is 50 pts
now imagine you'd sell Chantrelles (1 pt) to get a pearl - you'd need 50 Cantrelles to buy it
let's say you want to buy Brickwallmetals
average is
10 pts for a bar of wallgrade quality wrought iron
20 pts for a bar of wallgrade steel
now assuming you build a small wall with one gate - you'd need a initial Cornerpost - 10 wrought and 4 Cornerposts - each 5 wrought / 20 wrought
and 5 Steel for the gate
30 wrought and 5 steel is (average) 400 pts - so you'd need 8 pearls q 10 or 400 Chantrelles to buy
Now like with every market you'll find offers that differ from average (paying 2 pts per Chantrelle or take less pts for wg metals) - but 99% of trading people calculate with 1 pearl q10 = 50 pts