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The given sentence is missing in the paragraph below. Decide where the given sentence best fits among the options (1), (2), (3), or (4) indicated in the paragraph.

Sentence: This potential for direct, peer-to-peer cross-border transactions bypasses existing correspondent banking networks, thereby introducing novel vectors for external influence on a nation's financial system.

Paragraph: Central Bank Digital Currencies (CBDCs) are gaining traction globally, heralded for their potential to revolutionize payment systems, enhance financial inclusion, and bolster central bank control over monetary policy. They represent a significant technological leap beyond traditional fiat currencies, blurring the lines between cash and digital assets. (1) Domestically, a sovereign CBDC could provide real-time data for policymakers and improve payment efficiency, yet the international dimension presents a more formidable challenge to national monetary autonomy. (2) The widespread adoption of a foreign CBDC, especially from a major economic power, could precipitate a form of 'digital currency substitution' or 'e-dollarization' in smaller economies. (3) This dilution of domestic monetary control could severely impair a central bank's ability to manage interest rates, inflation, and capital flows independently. (4) Consequently, navigating the intricate balance between technological innovation and the preservation of monetary sovereignty has become a paramount concern for policymakers worldwide.

Correct Answer: Option 2
1. Logical Contextual Analysis:
Before Option 2: The preceding sentence states that "the international dimension presents a more formidable challenge to national monetary autonomy." This introduces the topic of cross-border implications and threats to sovereignty.
The Inserted Sentence: The inserted sentence explains *how* this "international dimension" poses a challenge. It specifies the mechanism: "direct, peer-to-peer cross-border transactions" that "bypasses existing correspondent banking networks," leading to "novel vectors for external influence." The pronoun "This potential" refers directly to the international dimension just mentioned.
After Option 2: The subsequent sentence provides a concrete example and consequence of these "novel vectors for external influence" – namely, "digital currency substitution" or 'e-dollarization,' which are specific forms of foreign influence.
2. Why the other options are incorrect:
Option 1: Placing the sentence here would be premature. The paragraph is still discussing the general characteristics and domestic benefits of CBDCs. The focus on cross-border challenges and external influence has not yet been properly established, making "This potential" lack a clear immediate antecedent.
Option 3: This option follows the mention of 'e-dollarization.' The inserted sentence explains the *mechanism* by which such foreign influence becomes possible (bypassing networks). However, the sentence immediately following Option 3 ("This dilution of domestic monetary control...") is a direct *consequence* of 'e-dollarization'. Inserting the proposed sentence at (3) would interrupt this direct cause-and-effect flow, explaining a prior mechanism *after* a specific outcome has been stated.
Option 4: At this point, the paragraph has already detailed the erosion of monetary control and its implications (managing interest rates, inflation, capital flows). The inserted sentence, which describes the *initial mechanism* of cross-border influence, would be out of place after the specific effects have been enumerated and the paragraph is moving towards a concluding summary.
3. Placement Summary:
The sentence logically elaborates on the 'how' of the international challenge to monetary autonomy, serving as a crucial bridge between the general mention of international implications and the specific threat of 'e-dollarization'.