The difference between the parties is a lot less than you might think. The fact is, both parties need tons of money to run election campaigns, because these days elections are decided mostly by whoever spends the most. They both get this money from the same sources! So both parties' success depends on pleasing the same sponsors.
So what happens is the two parties spend all their time and money and energy trying to differentiate themselves in the marketplace. Think of two competing laundry detergents sitting side-by-side on a supermarket shelf. ALL laundry detergents work about as well, so detergents advertise in a way to distinguish themselves, to make themselves look DIFFERENT. That's our two parties.
The real difference is that Republicans tend to want the economy to improve quickly short-term, at the expense of long-term consideration. While Democrats favor slower, steadier growth. If you look back as far as the late 1920s, Republican presidents have always bragged about how fast the stock market is rising--and it's certainly soaring right now!
But there are two problems with this. The first is that the stock market only makes rich people richer. The middle class has lost ground continuously since the late '70s, and it's still losing ground today. Middle class people are a little poorer every year.
The second problem is that this quick growth leads to a crash. EVERY Republican president since Herbert Hoover has ended up leading us into a recession when the bubble popped. The last one, in 2008, was the worst since 1929. In fact these days we only get a Democratic president after a Republican president has steered the economy into the ditch. Many economists believe Trump's recession is just around the corner because he's increasing the national debt so quickly. (But economics is not really a science, in fact today it depends mostly on what party the economist belongs to.)
For years there was a battle in the Republican Party between moderate and extremists. And IMO the wrong side won. Today there's a battle in the Democratic Party. For years they've been 'Republican Lite'--presidents Clinton and Obama were not really -liberals-. But now there's a fight whether the party should return to its liberal roots and start helping the 98% of people who need to work for a living rather than just continue the 40-year trend of more and more concentration of wealth. We'll have to wait to see how that turns out.