To amplify what others have said, people take their impression of what is normal from their peers, and what they see around them … which means sources like TV.
The problem with this is that much of what we see from both sources is often distorted.
First, what we see in others is often distorted by the plague of un-frugality that afflicts our society, combined with our habitual secretiveness about financies. In general, people overspend on consumer goods and luxuries and undersave. The result is that what we see in our peers and surroundings is that people are spending like mad on fancy cars and luxurious houses and furnishings; what we don’t see is how much of this is financed through debt - or at best, by people who spend far more then they ought, at the expense of rational levels of savings.
Second, the media aids and abets this perception in countless ways. Look where you will, in TV shows and ads the “average person” is pretty consistantly depicted as living in a luxurious house surrounded by expensive consumer goods that are either well out of reach of the actual “average person” or, alternatively, can only be afforded by the above-noted frantic spending and lack of savings.
Confession time: I am a lawyer in a major Canadian city by profession and my income is, as I know, quite high compared to the norm. I support a family. I save what I consider to be a rational amount for the future and retirement. Given these facts, I can afford many things, like a house and a certain level of spending, but I cannot really afford much by way of serious luxuries. I cannot afford a luxury car, or a vacation home; even serious home renovations are a stretch - that is, I cannot afford these things, and still save money for retirement, for my kid’s education, etc.
In short, I can just afford the “average middle class lifestyle” as depicted in various media and as seen on my street and many like it, and no more. Yet pecentage-wise, I’m in the top 1% of earners. How do others who earn less do it? Logically, the only answer is - they aren’t saving. If they are earning less than me, have no inherited wealth, and yet have more luxurious surroundings, they must, inevitably, be spending a greater percentage of their income - at the expense of savings - or running up debt.