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By Dr. David Edward Marcinko; MBA MEd

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Implications for the Coholding Puzzle

The relationship between saving and borrowing is more complex than traditional economic theory suggests. Standard models assume that rational households smooth consumption over time, borrowing when income is low and saving when income is high. Under this view, saving and borrowing are substitutes: a household should not borrow at 20 percent interest while simultaneously holding cash earning 1 percent. Yet real‑world financial behavior contradicts this assumption. Many households maintain liquid savings while also carrying expensive credit card balances. This phenomenon—known as the coholding puzzle—raises a deeper question: Does saving somehow cause borrowing, or are both driven by underlying psychological and structural forces?

1. The Traditional View: Saving and Borrowing as Opposites

In classical economic models, saving and borrowing are mutually exclusive choices. A household with access to credit should borrow only when necessary and repay debt before accumulating savings. The logic is straightforward: if the interest rate on debt exceeds the return on savings, paying down debt is always optimal. Under this framework, saving cannot cause borrowing because the two are substitutes. A household either needs liquidity (and thus borrows) or has excess liquidity (and thus saves), but not both.

However, this model assumes perfect rationality, perfect information, and no psychological frictions. It also assumes that households treat all dollars as interchangeable. The coholding puzzle demonstrates that these assumptions fail in practice.

2. Behavioral Explanations: Mental Accounting and Self‑Control

Behavioral economics offers a more nuanced explanation. One of the most influential concepts is mental accounting—the tendency for individuals to categorize money into separate “accounts” with different rules. A household may maintain a savings account labeled “emergency fund” that they refuse to touch, even while borrowing on a credit card to cover routine expenses. In this case, saving does not cause borrowing directly, but the act of saving creates psychological boundaries that make borrowing more likely.

Self‑control also plays a central role. Many households use savings as a commitment device: they save to protect themselves from their own future impulsive spending. But when short‑term needs arise, they may still borrow because accessing savings feels like breaking a promise to themselves. Thus, saving and borrowing coexist because they serve different psychological functions.

3. Liquidity Preference and Precautionary Motives

Another explanation is precautionary saving. Households value liquidity because it provides security against income shocks, medical emergencies, or job loss. Even if they carry debt, they may be unwilling to deplete their savings because doing so increases vulnerability. In this sense, saving can indirectly cause borrowing: the desire to maintain a liquidity buffer leads households to borrow rather than draw down savings.

This behavior is especially common among financially constrained households who face income volatility. For them, savings are not simply a financial asset but a form of psychological insurance. Borrowing becomes a tool for short‑term cash flow management, while savings remain untouched for true emergencies.

4. Institutional and Structural Drivers

Beyond psychology, structural factors also contribute to coholding. Many households face credit constraints that limit their ability to borrow cheaply. High‑interest credit cards may be the only available option, while savings accounts are easy to open and often encouraged by employers or financial institutions. Automatic payroll deductions, employer‑sponsored savings programs, and tax‑advantaged accounts can all increase saving even when households are simultaneously borrowing.

Moreover, the timing of income and expenses matters. Households with irregular income—such as gig workers, service workers, or contractors—may borrow to smooth consumption between paychecks while still saving during high‑income periods. In this case, saving and borrowing are not opposites but complementary tools for managing volatility.

5. Does Saving Cause Borrowing? A More Precise Interpretation

Saving does not mechanically cause borrowing, but it can create conditions that make borrowing more likely. Three mechanisms stand out:

• Mental segregation of funds leads households to borrow rather than dip into savings.
• Precautionary motives encourage maintaining savings even when borrowing is necessary.
• Institutional incentives promote saving automatically, while borrowing remains accessible and sometimes unavoidable.

Thus, saving and borrowing are not substitutes but co‑produced behaviors shaped by psychological needs, financial constraints, and institutional structures.

6. Implications for the Coholding Puzzle

Understanding the interplay between saving and borrowing helps explain why coholding is so widespread. The puzzle is not a sign of irrationality but a reflection of competing financial goals. Households want liquidity, security, and self‑control, and they use both saving and borrowing to achieve these goals.

This has several implications:

• Coholding is often a rational response to uncertainty. Maintaining savings while borrowing allows households to preserve a buffer against future shocks.
• Debt repayment is not always the dominant priority. Emotional and psychological factors can outweigh interest rate differentials.
• Financial advice must account for mental accounting. Telling households to “just pay off debt first” ignores the psychological value of savings.
• Policy interventions should consider liquidity needs. Programs that penalize early withdrawal from savings accounts may unintentionally increase borrowing.

7. A More Realistic Model of Household Finance

The coholding puzzle reveals that household finance cannot be understood through purely rational models. A more realistic framework recognizes that:

• Households face uncertainty and volatility.
• Psychological needs shape financial decisions.
• Savings and debt serve different functions.
• Financial behavior is path‑dependent and context‑dependent.

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EDUCATION: Books

SPEAKING: Dr. Marcinko will be speaking and lecturing, signing and opining, teaching and preaching, storming and performing at many locations throughout the USA this year! His tour of witty and serious pontifications may be scheduled on a planned or ad-hoc basis; for public or private meetings and gatherings; formally, informally, or over lunch or dinner. All medical societies, financial advisory firms or Broker-Dealers are encouraged to submit an RFP for speaking engagements: CONTACT: Ann Miller RN MHA at MarcinkoAdvisors@outlook.com -OR- http://www.MarcinkoAssociates.com

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