My teacher wrote Assets = Liabilities + Capital on the board and called it the dual aspect concept. I don't understand why every transaction has two effects.
The dual aspect concept states that every business transaction has two effects of equal value, one a debit and one a credit, which is why total assets always equal total claims against them. Those claims come from outsiders (liabilities) and from the owner (capital), giving the accounting equation: Assets = Liabilities plus Capital. For example, if the owner invests 50,000 cash, the asset cash rises by 50,000 and capital rises by 50,000, so both sides stay equal. If the business buys furniture for 10,000 cash, furniture (asset) rises by 10,000 while cash (asset) falls by 10,000, keeping the equation balanced. Every transaction keeps the equation in balance because of this twofold effect. This concept is the foundation of the double entry system, where for every debit there must be an equal and corresponding credit.
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