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The assurance of completion of trades is primarily guaranteed by both sides of the trade being held to their obligations. This means that when a buyer and a seller enter a trade agreement, there are institutional frameworks, legal contracts, and regulatory oversight in place that compel both parties to fulfill their commitments.

When a buyer places an order to purchase a security, they are legally bound to pay the agreed-upon price, while the seller is obliged to deliver the security. Without this binding obligation, trades could become speculative and untrustworthy, leading to a breakdown in market confidence. Such legal and regulatory structures, including exchange rules and centralized clearinghouses, help mitigate the risks associated with default and ensure that trades are consistently settled as intended.

While factors like high liquidity can facilitate smoother trading and may lead to more rapid transactions, they do not inherently guarantee that all parties will meet their obligations. Voluntary agreements between buyers and sellers do not offer the same level of assurance without underlying enforcement mechanisms. Additionally, trading systems requiring no oversight could potentially lead to failures in trade fulfillment, creating opportunities for disputes and trade failures. Therefore, the enforcement of obligations is key to ensuring assured completion of trades.