We overrate motivation and underrate friction

In September 1998, the British government introduced legislation to make paracetamol overdoses harder. From then on, shoppers were only allowed to buy one pack at a time and the maximum size of a pack was reduced (to 32 pills in a pack bought from a pharmacy and just 16 pills in generalist stores). Even in a matter as serious as suicide, the addition of this tiny amount of friction had a beneficial impact. In 2013, Professor Keith Hawton, a director at the Centre for Suicide Research at the University of Oxford, undertook a study to understand the legislation’s impact. After analysing mortality data (1993-2009, ONS) in England and Wales he estimated that there was a 43% reduction in deaths involving paracetamol after the legislation. That equates to an estimated 765 fewer deaths in the 11-year period he studied.

The important detail is the packet.

In 1998, Britain limited the number of paracetamol tablets sold in a pack. A later analysis estimated 765 fewer deaths involving paracetamol over eleven years. The intervention made no grand attempt to rewrite despair. It changed what was available during a dangerous interval.

Sixteen tablets in a general shop. Thirty-two from a pharmacy. To obtain more, another action became necessary: another packet, another transaction, perhaps another person noticing. That small interruption looks almost insulting beside the seriousness of suicide. The result is exactly why it deserves attention. Human behaviour often turns on minutes, availability and the next physical step while public language reaches for beliefs, awareness and motivation.

The estimate deserves its uncertainty. Other things changed. People could substitute another method. Some legitimate customers faced inconvenience. A policy can reduce one recorded harm while moving difficulty elsewhere. None of that makes the packet a footnote; it tells us what else must be counted.

The timing matters. A belief campaign hopes to influence a decision somewhere in the future. Pack size changes the immediate sequence at the point of access. Its effect can disappear for a planned act and matter greatly for an impulsive one. Lumping those circumstances together under “motivation” erases the minutes in which the policy operates.

There is also something politically awkward about modest physical changes. They offer no heroic conversion story and identify no single villain. A packet becomes smaller. Mortality data changes afterwards. Causation must be estimated patiently while every side reaches for a cleaner slogan.

I distrust interventions that require a person at their worst moment to remember a worthy sentence from a campaign. The shelf does not need to be remembered. It is simply there, containing fewer tablets.

Someone arrives at a till. One packet is sold. Acquiring the same quantity now requires a second act. The analysis follows mortality data through the next eleven years.