Are all suburban centres the same?

Last week I looked at the geography of suburban jobs in Melbourne (Where are the suburban jobs?), finding there are 31 centres that account for just 20% of all suburban jobs. There is a large variation in the size of centres, with the largest four – Clayton, Tullamarine, Kew/Hawthorn and Box Hill – accounting for nearly half of the jobs in these centres.

Today I want to look at the economic functions of suburban centres, as indicated by their industry composition. If a centre is specialised by industry compared to jobs in the rest of the suburbs, it suggests it has a distinct economic role. It could also mean that the benefits of agglomeration may not be especially important.

Specialisation Index scores for suburban centres. 13 centres score 0.3 or higher. Dotted line shows score for suburban jobs located outside centres (click to enlarge)

Actually it’s a little more complex than that – specialisation implies that being in a large, diverse centre is not that important, but being spatially close to firms in the same or a related sector is. In other words, firms seek to minimise the costs of density by locating just with “their own kind” and avoid the overhead of firms from whom they obtain little benefit.

The data shows that the economic functions of suburban centres are many and varied and differ markedly from the 80% of suburban jobs that are not located in centres. Some centres are dominated by a single industry and accordingly have a distinct “personality”. There are thirteen such centres, mostly focussed on Retail or Manufacturing, although Latrobe is concentrated in Education and Heidelberg in Health.

Yet that only tells part of the story. With only one exception, all centres have a specialisation in at least one of 17 industries and some are specialised in multiple industries. For example, although Box Hill is not dominated by a single industry like Latrobe is, it nevertheless has specialisations in Health and Government (defined as having at least twice the share of jobs in each of these two industries as jobs located outside centres do). Health accounts for 27% of jobs in Box Hill and Government for 17% – the respective figures for suburban jobs outside of centres are just 11% and 4%.

Some centres like Burwood East, Sunshine and Broadmeadows are specialised in three industries. The only truly “diversified” centre is Kew/Hawthorne, whose sectoral composition is reasonably similar to that of the rest of the suburbs in all industries (note that larger centres tend to have fewer specialisations because there is less variability).

The most common specialisation is Retail, but Burwood East, for example, has a specialisation in Communications industries and St Kilda in Cultural industries. Six centres have a specialisation in Government and four in Health. However no suburban centres have a specialisation in either Finance & Insurance or Property & Business Services – these are primarily inner city and CBD functions.

Size is a very important factor. For example, although it has no specialisations, the third largest suburban centre, Kew/Hawthorn, has as many jobs in Education as Latrobe and three times as many in Communications as Burwood East. Not surprisingly, Tullamarine is very specialised in Transport, but still has more jobs in absolute terms in Retail, Hospitality, Communications, Personal Services, Property & Business Services and even Culture than Broadmeadows, which is a designated Central Activities District (CAD).

No. of industry specialisations for 31 suburban centres (click to enlarge)

There is a similar pattern in the human capital level of centres. Ten have a distinct over-representation of graduate jobs at the aggregate level. These “high human capital” centres are St Kilda, Footscray, Heidelberg, Glen Iris, Kew/Hawthorn, Clayton, Box Hill, Burwood East, Malvern and Latrobe. Even so, nearly all centres are specialised in graduate jobs in at least one industry i.e. the centre’s share of that industry is at least twice that for suburban jobs located outside of centres.

This is a pretty high-level and necessarily brief overview of suburban centres. All the same, it suggests a number of key issues.

First, not all centres are the same – they have different characteristics, different potentials and probably require different policy prescriptions. Second, some firms may not wish to be in diversified centres (and neither may their customers want them to be). Third, many firms favour large centres although it is not clear if they prefer high densities – it is possible that the extensive spatial footprint of larger centres indicates that firms avoid the burden of density by spreading out spatially. Fourth, size matters. Even though it only has one specialisation, Clayton has more absolute jobs in eight industries – including in Education, Health, Communications and Property & Business Services – than any other suburban centre.

2 Comments on “Are all suburban centres the same?”

  1. […] precinct is by far the largest concentration of employment in suburban Melbourne (here, here and here). It has three times as many jobs as the largest of the six existing CADs – Box Hill – […]

  2. […] the 31 major activity centres, 30 are specialised in at least one industry sector and many have multiple specialisations. Commercial Services is the […]

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