It's also important to understand different liability exposure for companies in different industries. For example, REITs (real estate investment trusts) use a lot more debt than software companies. But they use that bigger debt for good reason. A 20-year-old apartment building is probably worth more than when it was built; 20-year-old software probably isn't.
So looking beyond the offsetting asset, it's useful to understand how -- and if -- a liability is leading to higher returns. Was a big loan used to build a more profitable factory? If a retailer buys a lot of inventory, can it sell for more than the amount owed on the accounts payable side of the ledger, or will the retailer have to discount excess inventory?
In summary, liabilities aren't bad or good. They’re just one part of measuring a company's balance sheet. From there, understanding how that balance sheet either helps or hinders a company's progress will help you become a better stock picker.