Hello Michael. On your My Corporations page click on Supplies. Most likely your corporations are using the default order strategy with a Low-water mark of only 4 months. The Low-water mark is the number of months worth of supplies your corporation has left until they order new supplies. 4 months is too low, unless supplies in the market are in surplus you will most likely not get those supplies within 4 months. At least not all of them. You should probably set a higher Low-water mark. I set mine at 12 months. You can keep the order quantity at 9 months if you wish. Setting a higher order quantity will ensure more months of supplies when you order them, but since you're ordering more at once your corporation will use more cash at once. So it's really up to you to set that what you'd like. It will not effect the profitability of the corporation as long as it is fully supplied. 9 months is fine, I often match mine to my low-water mark. Hopefully this helps.
While you're there you can also set the supply quality. You should set the supply quality at least as high as your corporation quality upgrades. Your corporations should have 200 in quality unless they're new corporations which start at 100 and automatically upgrade to 200 over time. I set mine at 210 for state corporations that are at 200 quality. You don't want to set the quality of supplies too high however, since the cost to return investment will be lower as your corporation will not produce a much higher quality product.
