Probation periods: How I see it at the moment
Posted December 10, 2008
on:In net terms I am AGAINST the probation policy being put through today. That puts me in a pretty significant minority among my economics peers, oww well it gives us something to talk about. However, I would also add that I am NOT THAT against it – I am only against it in net terms because of value judgments.
In the comments on this post I stated:
When people make a contract they are agreeing (to set) down things that they are willing to accept given bargaining power etc – but ultimately they will only accept a contract when it makes them better off.
Now if the employer really values the probation period and the employee doesn’t care it should be allowed to happen – and it can in current law. If the employer doesn’t care and the employee does, the employee will take a lower wage to avoid it – all good, and as long as the firm is over the size of 20 employees the new law is cool with that.
However, there is a signaling issue because of a market imperfection – asymmetric information. In this case, the existence of a pure probation option leads to “too many” people getting stuck in these types of contracts, compared to the socially optimal level.
As a result, legislation to decrease the usefulness of probation periods could be socially optimal – however, the magnitude of these costs is the debatable issue.
Fundamentally the signaling issue is that the firm will assume people who do not want a probationary period are “bad employees”, even if in actuality they are just really don’t like the probation period! As a result, some employment relationships will end up with a probationary period, even if both the firm and employee don’t want it! This implies that the use of probation periods will be GREATER than the socially optimal level. Current costs surround the use of such contracts reduced the use of such a clause – which could have increased social welfare.
Given the prevalence of small firms in New Zealand, and the sensitivity of a “signaling equilibrium” to small shocks, a small change in labour law could lead to a significant increase in the number of contracts with probation periods. With my value judgment that the current number of probation contracts used is close to optimal (this is something we can debate 🙂 ) any law that increases the number significantly is no good.
Discuss 🙂
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14 Responses to "Probation periods: How I see it at the moment"

Matt, it seems I could easily reverse your example, and say we’re currently stuck in an ineffecient equilibrium where employers want to use probation periods but are afraid that would signal that they’re bad employers who are prone to firing.
I realize that assessment of this policy hinges on a number of aspects for which their is no quantitative data yet, but my instinct is that workers hiding their type (hard-worker or shirker) is a bigger inefficiency than employers hiding their type (good or bad employer). I base this on the fact that the returns to securing a good job through hiding your quality seem a lot higher than the gains from constantly firing and rehiring (given that new workers normally cost the firm in net terms).


The so-called ‘probationary period’ is current law is really quite different to the National proposal because the employer still has to follow quite strict rules about process. The employment court will rule in favour of the employee whenever it can, e.g. if the employer makes any kind of procedural error in the dismissal process. It is really quite tricky for employers to get rid of anyone in a way that the employment court will find acceptable.
This does away with all of that, but only for the first 90 days. That is the principal advantage.


Matt, I don’t doubt you can model a situation where compulsory probation is bad compared to “perfect information, negotiable probation”, but I really think the question here is whether it is bad compared to “imperfect information, no probation”, which on the basis of Nigel’s comment, is the status quo.


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December 10, 2008 at 3:39 pm
What is the cost of having ‘too many’ probationary contracts? Do you think that firms will use them as a way to employ people short term where a fixed-term contract would be illegal? That’s certainly what I’d be worried about, absent of any actual knowledge 😛
Putting that concern aside, you suggest that a signalling model would be appropriate for analysing this situation. As such, the ‘good’ employees would actually be in favour of probation periods if they were a credible signal. So wouldn’t reducing the barriers to making the signal actually improve market efficiency (presuming that it doesn’t increase the ease with which the signal can be faked)?
I suppose what I’m asking is really what you’ve invited by your post: what makes you think that barriers to efficient signalling are producing an optimal outcome?