You can't have it both ways. Either consumption is encouraged via inflation or investment is encouraged. For example, say that prices were slightly deflationary, as they are with computer equipment, across the board.*
I could easily make the case that saving goes up! Why? Well if I took my goldbucks and lent them to you at 1% interest we would both be happy. My total return would be something like 3% per year (2% deflation + 1% interest) non-risk adjusted. You would be happy because there are plenty of people that are willing to lend money to you. Because you have access to lending capital, you hire more decreasing unemployment. You can try to make the case that you wouldn't hire because there would be no demand for your goods, but in practice there are A. Other countries, and B. A precedent that people do continue to buy, even during deflationary pressures.
The reason people buy computers and cars despite the fact that they are becoming better and cheaper as time goes on is that they expect that cars and computers are going to continue to get better and cheaper as time goes on. They know that they will face the same "save or spend" decision 2 year later, and they really do need a computer and a car.
The problem with inflation is that "encouraging spending" practically only happens to the poor or middle lower class. I can afford to research gold, silver, lithium, cesium, grain futures, bitcoins, etc. and protect my assets from long term depreciation, but they can't. So you end up with a class of people that have a negative net worth, that is totally unprepared for long term retirement.
* I know that money velocity starts to make a difference, but it is in effect the same as printing more money.