One last thing I noticed looking at your state corps is that even though many of them are fully upgraded (200) they only produce qualities at around 200. This way you won't make any profit. The reason is that your supply qualities in your corps are set at around 140-150, while they should be at average around 190 for fully upgraded corps, so that these corps will produce a quality of 273.6 and make some serious profit. So, to make a long story short, set supply quality for all your "old" fully upgraded corps at 190 (there are better ways to do this but let's leave at this for now - this should start making you $$ asap). For the new corps that are not upgraded set your q at 120 and raise it gradually as you upgrade. Ah, and while you're at it, increase corp wages because 100 is too low. Set them up as your profits go up. At the same time, set government wages to follow them at 75% of corp wages.
That's about
First of all, thanks for all your tips. I changed social security to 80%, increased the priority for making teachers, I am not sure how I should get rid of material shortages, I set the buying quality to 120 from 150 for each corporation, and I am unable to find out how to change my supply qualities in my corporations.
You could also increase salaries as this will bring in tax revenue beyond your increased costs. Set these at least at 200 for gov and biz. Increase when you are doing better.
The buying q should be @120 only for new corps. For your upgraded corps it should be around 190. This is the supply qualities of your corps. The other "supply qualities" I was mentioning were for your country (Trade>Order strategy and quality). Go there and change everything into 120. Then change cheap per unit things like Construction, Telephone, Services etc to 200 gradually going up to 300 as your country progresses.