Exactly, he has no money with which to turn his demand (desires) into economic activity. A part is missing or broken from the usual cycle.
There's nothing missing at all.
There's no such thing as just "consumption". People consume goods comes by trading one thing of value for something else of value.
Consumers have money to consume things because they are producers first. They traded their time and skills for wages, or used their knowledge to reap returns on investments.
Consumers do not magically pop into existence to throw money at economic goods.
Never heard of luxury goods?
Yes, but that's not enough to drive the entire economy.
Are you kidding me? The vast majority of things that the Western world enjoys are luxury goods by definition.
You will not die from lack of a car, or laptop, or Internet access, or smartphone, or fast food or fine dining, or all the trivialities you enjoy in your day to day life.
Humanity has existed for thousands of years without those goods ever existing - that they are mass produced and available to many individuals first world nations is a giant market of luxury goods.
It takes complete ignorance of what it means to live without to look at the Western world overflowing with luxuries and claim, "can't build an economy on luxury goods".
What are you ranked in the world's income percentiles?
If it's above $34k, you're in the top 1%. It only takes $1.5k to be in the top 50%. Source