… is that the metric does not capture the new ways that people get information.
Traditional media – such as TV, radio, presses, and outdoor media – have been traded on reach, GRPs, and frequency. The most basic of dictums in media planning is “reach X% of people at least Y number of times in order to effect a change in their behavior, as cost-efficiently as possible”.
This statement is in essence based on a “trade-off” between the number of people one reaches and the information complexity that a medium can carry and deliver. It is the foundation of media economics – and why TV ad lengths rarely go beyond 30s or 45s, why presses are limited to full-page/full-color, why radio ads are usually 30s or 60s, and why outdoor ads – which are probably the most wide-reaching and high-frequency media [and cost-efficient too!] – can’t communicate information details.
The ‘trade-off’ between complexity and reach is also the reason why media planners think of audiences in need of as constant “learning” through “effective-frequency”-based planning.
This is no longer true.
The tradeoff is based on several assumptions that have been taken to be reflective of reality in the marketing world:
- People do not interact
- Information flows in a linear manner from one person to another
- The medium can be separated from the message or the information it carries
- Nobody can “touch” the message – there is no ‘message decay’ or ‘information depreciation’
- There is a constant “noise-to-signal” ratio from one person to another, from one time to another, from one place to another
What do we do?
It’s time to create a new currency for media planning. It should be one that takes into account not just the number of people reached, but the information’s complexity and the ‘quality’ of the reception amongst its intended targets. It must also be one that takes into account the possibility of “non-linear jumps” in the information transmission.
Could epidemiology point us to the new currency?
Potentially.
I am not an expert in epidemiology nor the models that epidemiologists employ in explaining and predicting how diseases, such as measles, the flu, and colds, evolve across time. It appears – from remnants of my university days that the models in epidemiology could potentially help in the creation of a new currency.
One of the most common ones is the Susceptible-Exposed–Infected-Recovered [SEIR] model, which can also be extended as follows:
The equations are far more complicated than the usual Reach = GRPs x Average Frequency that we are used to.
And one could argue that “wait, that is a process – not a currency”.
And that is the point.
A currency for media planning needs to be based on how information flows – or at least how specific media or channels contribute to the process.
New wine in old wineskins…
Technology in the hands of consumers and of audiences have changed the way media are used and consumed. It has also changed the ways information is transmitted, digested and internalized, and retransmitted.
We can’t forever be stuck with the old “GRP” and “reach” framework given the new realities that we are now facing in communications planning.
Reach is simple – but given the complexities we now face, it has become simplistic. And incomplete.



