The report says only two champions recorded negative GDP growth in the first three months after lifting the trophy. Over 12 months, that number rose to four.
Household spending was more encouraging, increasing in 12 cases during the following year. Car sales followed a similar pattern, while business confidence improved in all nine episodes with available figures. Industrial production was weaker, falling in five of 15 cases.
That combination points to a short-term confidence boost rather than a dependable growth engine. Fans may spend more, but the wider economy still depends on policy, investment and existing conditions.
Inflation is the clearest warning. The report says prices accelerated between the third and 12th month after the title in almost every case. Germany, after its 1974 triumph, was the notable exception.
Argentina provides the starkest examples, with inflation reaching 16%, 110% and 211% 12 months after its three championships. The report links those outcomes to economic imbalances that were already in place, rather than presenting the trophy as the sole cause.
Financial markets were equally mixed. Ten-year government bonds delivered negative returns in five of 12 cases over three months and six of 12 over a year. Foreign direct investment fell in six of 13 cases.
The electoral record is less flattering. The report says general elections took place within a year of the World Cup in eight instances, but governments already in power won only three times.
A title can improve national confidence, yet voters still judge inflation, wages and public services. The next champion will therefore face two tests: converting emotional momentum into durable economic gains and surviving the first election cycle after the parade.