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Your debt is now quite high. This is no reason for concern but it does cost a lot in interest payments. You may invest further and increase your debt but you must be aware that there is a limit to what you may borrow and at some point, you must start reducing your debt. Check interest payments as a fraction of your cost. If they become a major factor, try to improve the profitability of your corporations before you continue with large investments. Once you are profitable, investments can continue.