It will increase, which is why the equity section increases. For example, if 100 shares of $10 par common stock are issued at $10, the entry is:
Cash.................................1,000
Common Stock..............................1,000
Just for your info (not this problem), if they were issued at $12, the entry would be:
Cash..................................1,200
Common Stock........................................1,000
Additional Paid-In Capital.............................200