Doesn't 1 and 2 contradict? I know a large part of US economy is fueled by domestic consumption. You're saying it's not enough? US are the biggest consumers in the world, so this is a nebulous concept. So you're saying we're deflating because we're not spending some arbitrary amount that's higher. If this is known historically why don't they just produce less?
Contrary to popular belief millennials are not the consumer generation they are made out to be. The average millennial makes less and works more than the previous generation. The avocado toast meme was made to sell news articles and does not have a hint of truth to it. The millennials, on average, are the poorest of any generation in the last 50 years adjusted for age primarily due to student loans, poor job prospects (TWO financial disasters in just over the "critical decade" of age 25-35), and wage stagnation. Anti-consumerism is a major theme in many millennial circles. If you want a consumer class look at the boomers and Gen-Z.
They don't produce less because money is virtually free. There's no value tied to the money the business used to buy factories to produce widgets. It costs nothing to produce something thanks to the globalization of labor. Why not throw 200,000 widgets on the sales floor. Eventually they'll sell. It's not like it was your money you spent anyway!