Final answer:
Debt obligations require repayment with interest, including promissory notes and bonds, while stock represents equity ownership without repayment obligations.
Explanation:
Debt involves obligations that must be repaid with interest in the future. It commonly includes promissory notes, which are a form of credit used as a substitute for currency, and bonds. On the other hand, stock represents equity ownership in a company and does not involve a formal obligation for repayment.
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