What We Cover
Four transitions. Each one reshapes your financial psychology in ways that take years to fully surface. We explore what the research says about each of them.
When two money histories share one address.
The psychology of cohabitation and money is more complex than most couples expect. You arrive with different relationships to spending, different comfort levels with debt, different mental accounts for what money is "for." Within months of moving in together, both people begin to adapt. Behavioural economists describe this as the formation of a shared financial identity, and the process is neither smooth nor automatic.
Research drawing on mental accounting theory shows that joint financial arrangements change how individuals categorise their own spending. Money that once felt clearly "mine" becomes ambiguous. This ambiguity can produce guilt around personal spending, resentment around shared obligations, and a subtle but real erosion of financial autonomy that neither person anticipated.
We explore questions like: why do couples so often avoid having explicit money conversations early in cohabitation? What does the research show about the relationship between financial transparency and relationship satisfaction? How do different money scripts, formed in childhood and adolescence, collide in shared households? And what happens to individual risk tolerance when financial decisions are made jointly?
Risk looks different when you are responsible for someone else.
Becoming a parent for the first time produces a measurable shift in financial risk tolerance. This is not simply a matter of having more expenses. It is a change in how the future feels. Studies in behavioural economics have shown that new parents systematically alter their probability assessments for both positive and negative financial outcomes. The future becomes simultaneously more important and more frightening.
Prospect theory, developed by Kahneman and Tversky, helps explain part of this. When the stakes feel higher, the pain of potential losses is felt more acutely than the pleasure of equivalent gains. For new parents, the stakes feel considerably higher. This asymmetry influences everything from how they approach insurance decisions to how they think about pension contributions to how they respond to investment volatility.
We also look at the phenomenon researchers call "status quo bias amplification" in new parents, the tendency to freeze financial arrangements rather than revisit them, because the cognitive load of early parenthood makes any additional decision-making feel overwhelming. This freeze can have long-term consequences that parents only notice years later.
Financial identity in the aftermath of a shared life.
Separation involves two simultaneous and often contradictory psychological processes. One is the practical disentanglement of shared finances. The other is the reconstruction of a financial self that has been defined partly in relation to another person. Both are demanding. Both are underexplored in the mainstream literature on personal finance.
Research on loss aversion is particularly revealing here. The financial losses associated with separation are real and often significant. But the psychological experience of those losses is shaped by more than their size. It is shaped by who you believed you were financially, by the mental accounts you had built around shared goals, and by the grief that makes clear-headed financial thinking genuinely difficult for months or years after the relationship ends.
We draw on work by Shefrin and Thaler on the behavioural life-cycle hypothesis, on research around emotional decision-making under stress, and on studies of financial recovery after major life disruptions. We are interested in the long shadow that separation casts on spending patterns, saving behaviours, and attitudes toward financial risk, often in ways that persist long after the practical settlement has been concluded.
The decumulation paradox and the psychology of enough.
Retirement is one of the most studied transitions in behavioural economics, and one of the most poorly understood in practice. Decades of research have established that people's actual behaviour in retirement diverges significantly from what rational economic models predict. Many retirees spend far less than their resources allow, particularly in the early years when they are most physically able to enjoy it. Others experience anxiety about drawdown that persists even when their financial position is objectively secure.
The decumulation paradox describes the difficulty of switching from a lifetime of saving behaviour to a pattern of deliberate spending. The psychological habits that made someone a good saver, the aversion to spending, the comfort of watching balances grow, do not simply switch off at retirement. They persist, sometimes to the point of genuine deprivation.
We also explore the identity dimension of retirement that financial planning rarely addresses. Work provides structure, purpose, and social connection. When it ends, the financial behaviours that were anchored to a working identity can become destabilised in ways that show up in spending patterns, risk appetite, and attitude toward financial planning itself.
The ideas that shape how we think.
Our articles draw on a body of academic work that has developed significantly over the past four decades. These are some of the core concepts and research traditions we return to repeatedly.
Prospect Theory
Developed by Daniel Kahneman and Amos Tversky, prospect theory describes how people evaluate potential losses and gains asymmetrically. The pain of losing something is felt roughly twice as intensely as the pleasure of gaining the equivalent amount. This has profound implications for how people make financial decisions during transitions that involve real or perceived loss.
Mental Accounting
Richard Thaler's work on mental accounting describes how people categorise money into separate psychological "accounts" that do not behave like a rational single pool of funds. Understanding mental accounting helps explain why merging finances in a relationship feels so psychologically significant, and why separating them during a breakup is so disorienting.
Behavioural Life-Cycle Hypothesis
Shefrin and Thaler's extension of the traditional life-cycle hypothesis incorporates psychological factors into how people plan financially across their lives. It helps explain the saving and spending patterns we observe in people approaching and entering retirement, including the decumulation paradox that affects many retirees.
Status Quo Bias
The tendency to prefer the current state of affairs, even when changing it would be beneficial, is well documented in behavioural economics research. It appears powerfully in financial decision-making during major life transitions, when cognitive and emotional load is high and the appeal of inaction is strongest.
Approaching retirement? We have a dedicated section for you.
The years before you stop full-time work deserve particular attention. We have written about them at length.
For Pre-Retirees