I am looking for an economical, but low-maintenance solution for a water heater.

The primary economic driver here is food packing, produce distribution, and farming. 

Owning just a couple of single family rentals can be annoying/time intensive until you grow big enough to economically scale to complete automation...

Buy an economical USED car and start living as frugally as possible.

For foreign investors, I tell them to set a price range and start looking into cities that:-Experiencing steady growth-Have well diversified economic basis' (tourism, energy, tech, etc.)That's pretty much it.

That's a good sign for continued economic development.

Look at economic indicators such as employment, basic supply and demand, and diversification of employment.

She worked for the Economic Development Corp of NYC for a short while, and they guaranty loans of it leads to jobs, loans that you would not normally qualify for.

I wonder about the economic impact of that tax on development.  

I'll take a stab at answering the question as to having the highest total profits....Any area that has something unique to offer that people want will have high appreciation because of basic laws of economics.