The people who power the local economy started the year on the right foot.
The Yelp Economic Average rose by eight tenths of a point in the first quarter of 2019 after a tough end to 2018. In the last quarter of that year, YEA—a measure of the health of important sectors across the U.S. economy, based on Yelp's unique data set—fell by 2.2 points.
Local and professional services businesses drove the increase, but two major sectors bucked the trend by falling in the first quarter. Retail businesses continue to struggle. And automotive businesses extended their slump. In most major metros around the country, businesses associated with the auto industry have experienced a steady decline over the past two and a half years.
Building a Model to Measure Local Economic Performance
Methodology: The Yelp Economic Average (YEA) is a composite measure of the economy, reflecting both business health and consumer demand among businesses in 30 sectors.
The eight root categories
The 30 business sectors, or categories — the "Yelp 30″ — are drawn from eight umbrella business categories on Yelp: restaurants, food, nightlife, local services, automotive, professional services, home services, and shopping.
Root categories' share of the 30 components
The share of YEA components from each of these eight categories is based on each one's share of the economy, as estimated from County Business Patterns reports.
Choosing the Yelp 30
Each of the Yelp 30 is chosen based on maximizing four criteria, relative to other candidates within its family of categories, as measured in the first quarter of 2016:
- Number of businesses on Yelp in the category;
- Consumer interest on Yelp for businesses in the category;
- Number of the 50 metro areas — whose economic health we have been measuring a year and a half, originally as part of our Local Economic Outlook — in which the category is present;
- Uniform spread across the four Census Bureau-defined regions of the country.
Choosing baseline categories
We then chose baseline categories against which to compare the fortunes of the Yelp 30. This step helps remove changes due to seasonality and Yelp’s internal growth; what remains is a reflection of real economic patterns. We selected all other root categories not represented by YEA components as baselines because they provided the most robust controls against seasonality and activity on Yelp.
Calculating the YEA scores
For each of the Yelp 30 in each quarter, its two scores — one for business population and one for consumer interest — are calculated as follows:
- Number of businesses on Yelp in the category;
- Consumer interest on Yelp for businesses in the category;
- Number of the 50 metro areas — whose economic health we have been measuring a year and a half, originally as part of our Local Economic Outlook — in which the category is present;
- Uniform spread across the four Census Bureau-defined regions of the country.
Then the two scores are normalized to have the same variance, so that each contributes equally across components.
To reduce the effect of outliers, the overall score for both consumer engagement and business count is the median of each component’s score.
YEA is the mean of the overall consumer engagement score and business-count score.
We calculated equivalent scores at the regional and metro level to provide a local look at the state of the local economy.
