It doesn't matter - as far as the fractional reserve system exist, as well as legal capital reserve requirements - depository funds, CD, bonds, or share sales all count toward the lending limit of any bank.Your example is confusing as it isn't clear whether the $100 comes from equity investment or from a depositor. If from a depositor, I believe this should be 800 in loans... [Assets]: 100 reserves + 900 loan credit != [liabilities/equity]: 900 demand deposits
A bank can sell its shares, take no deposits, and still lend money - it will not participate in the fractional reserve system since it has no depositors.
A bank that takes deposits and sells it shares can use both source of funds to make loans, and all the money ..share sales+deposits.. can be fractionally loaned away.
So, there is no such thing as a "loan credit" from the banks accounting.
How the bank is allowed to lend is based on the capital base and modifiers applied to the components that make up that capital base. I think I have already provided the calculation.
PS: remember the money to buy shares for a bank comes from the banking system.
See my response to Steven re:"monopoly money example".they do not do so exclusively against demand deposits.