Welcome to Harry Potter Theory. Today we're discussing WIZARDING WEALTH. It’s a hot topic- people want to talk about. Why is Harry so RICH? Why do the Lestrange's have a vault full of gold? Who is the RICHEST family? These are all questions I’ve answered in the past. However, what I’ve never properly answered is how the Malfoy family were able to amass THEIR wealth. 
The wizarding world has an economy just like our own with mediums of exchange and a system of finance. And they also of course have their own wizarding money- coming in many different forms including galleons, sickles and knuts. Galleons are the largest form of currency, equivalent to about 17 sickles or 493 knuts.
According to the FORBES fictional 15 - which takes speculation to the next level when it ranks the net worth of all different sorts of fictional characters, Lucius Malfoy is worth an astonishing 1.3 billion USD or 943,542 pounds. If we convert that in to muggle currency, that gives us a figure of approximately 188,708,000 galleons- not bad Lucius. Astonishingly, the Malfoys are NOT the richest family in the wizarding world, but they’re certainly up there- probably top 3.
When we think of the Malfoy family lineage- certain words come to most people’s minds- but these words scarcely hold a positive connotation.  Usually when someone says ‘Malfoy’- you might think ‘bigot’ or ‘prejudiced’- but that’s a reputation that was earned through centuries of intolerance. In fact, the name Malfoy comes from Old French and literally means ‘bad faith’. These are characteristics almost ingrained in their bloodline, and it wasn’t until really, Draco, that this intolerance began to waiver somewhat. Historically, they are a wealthy family of morally crooked witches and wizards, that will whimper when caught red handed, and gloat when in a position of power. So, how did this family acquire their IMMENSE level of wealth? Well, I’m about to air their dirty dark secret- they’re rich EXCLUSIVELY because of muggles.