Why low salaries, low taxes on the rich, and sitting on one's money isn't good for the economy

Inequality is bad for the economy. When masses of people don’t have money they can’t spend it on goods and services, and therefore there is no consumption. The concentration of wealth in the hands of a few families is harmful for everyone in society. No matter how rich someone is, they can only buy so many cars, and dine at so many luxury restaurants. Their spending will be minuscule compared to the spending of thousands, or millions of people. Companies and businesses can't grow, competition just gets fiercer the way  things are now, which will lead to even more companies failing. If we want more growth and more social justice, as well as political stability, we need to have higher taxes on the rich and the biggest corporations, and raise wages. Simple as that.