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Each finding comes from a marketing, economics or operations journal, with what it means for you and a number you can check on your own data.

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Consumers call a quality cut unfair at more than twice the rate of a price increase, and the quality cut is the one nobody has to announce.

Share of consumers who called the move unfair, once told about it
Ten preregistered experiments, 208 to about 4,000 participants each. Journal of Consumer Research. From a brief written for a casual-dining steakhouse chain.

More from this summer's briefs, each written for one company.

The winner of a 54-arm, 61,293-member experiment on gym attendance was a nine-cent reward for coming back after a missed workout.

For a high-volume gym franchise · Nature

40%

One broken service commitment cost roughly 40% of that customer's lifetime value, and the most loyal customers punished it hardest.

For a casual-dining steakhouse chain · Manufacturing & Service Operations Management

$176

The same installment button costs a tail of adopters $176 a year in bank fees, and the median adopter nothing.

For a beauty retailer · Management Science

7.9%

When a retailer took control of delivery, customer spending rose 7.9%. The effect took nine months to show up.

For a catalog apparel retailer · Journal of Marketing

Inertia roughly doubles subscription revenue, and cancellations run 4x normal when members are forced to actively decide.

For a high-volume gym franchise · American Economic Review

7miles

Restaurants three to seven miles apart helped each other. Inside two miles they took each other's sales, and the help stopped dead at seven.

For a casual-dining steakhouse chain · Production and Operations Management

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