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Business Cycle and Growth

Growth research deals with the question which factors influence the long-term development of countries. Business cycle research, on the other hand, attempts to understand the causes of short- to medium-term deviations from the long-term growth trend and to forecast the likely further development in the short-run (typically 1-2 years).

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Traditionally, the gross domestic product (GDP), i.e. the sum of goods and services produced expressed in values, represents the central indicator of prosperity in economics. Economists have always been concerned with the question of which factors promote or inhibit economic growth in order to develop economic policies To be able to draw conclusions about how the long-term prosperity of economies can be secured or improved. In its research activities, the HWWI deals with the determinants of economic growth and explicitly includes further concepts of measuring social prosperity, such as life satisfaction, in its considerations.

Economies typically do not develop linearly along their long-term growth path. Rather, in all economies there are short- to medium-term fluctuations in economic activity to observe the growth path, the so-called business cycles. Economic fluctuations are often associated with frictions such as unemployment and inflation and create an inefficient use of economic resources. In today’s highly globalized world with complex international supply chains, there is a strong international economic context. Because of the strong international interdependence of financial, raw material and goods markets, this connection is particularly pronounced in times of financial crises, wars or pandemics. The HWWI researches the international economic context and analyzes its likely consequences for the German economy. In this context, the HWWI regularly forecasts the German economic development and also prepares a regional economic forecast for Hamburg. For this purpose, the HWWI uses the results of the quarterly economic survey of member companies provided by the Hamburg Chamber of Commerce. The survey data is also used to analyze the development of individual industries or types of companies. The HWWI pays particular attention to medium-sized companies where ownership and management lie in one hand.

As part of its economic and growth research, the HWWI also deals intensively with the development of the prices of a wide range of raw materials. The focus of the analyzes is the HWWI raw material price index, in which the world market prices of the most important products from all sub-segments of raw materials trading are recorded and condensed into a meaningful index using an objective weighting methodology. The weekly recalculation based on the latest data ensures that the information is up-to-date and generates high-frequency time series for differentiated trend and volatility analyses.

Publications

Press Releases

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02.09.2026 | Press Release 28

New HWWI-forecast

According to the latest figures from the Federal Statistical Office, the German economy performed better in the first half of this year than geopolitical burdens and the negative mood in this country would have expected; the price- and seasonally adjusted gross domestic product increased by 0.75% in this period and by 1.5% on an annual basis. At the same time, important reform projects – such as the health care reform (in force), a pension reform and a tax reform (both as a draft) – were launched. In addition, several economic and climate indicators have improved; however, the positive change in sentiment expressed here is not always reflected in public opinion. Apart from this, the continued weakness in private investment activity illustrates the continuing need for structural reforms.

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18.08.2026 | Press Release 27

HWWI-Commodity Price Index remains volatile: US-Iran MoU provides only temporary relief

In recent months, the HWWI-Commodity Price Index has shown strong volatility. In May, the total index recorded a further increase of 2.4 %. The following month brought temporary relief as the index fell noticeably by -9.2 % in June. Here, the negotiated US-Iran MoU is likely to have eased market tensions. However, this stabilization did not last: driven by the renewed resurgence of the conflict, prices picked up again by 2.2 % in July. Despite the intermittent fluctuations and the decline in the early summer, the markets reflect the ongoing geopolitical risks: in July, the overall HWWI-Commodity Price Index remained a significant 19.6 % higher than the corresponding figure for the previous year (as of August 17, 2026).

shallow focus photograph of black and gray compass
08.06.2026 | Press Release 26

New HWWI-forecast

After a good start to this year for the German economy, the outlook for growth and inflation has deteriorated significantly since the end of February due to the Iran war, in particular the closure of the Strait of Hormuz and the associated increase in energy prices. The closure of the Strait of Hormuz is now lasting longer than initially expected. The erratic US tariff policy is also noticeably dampening German export activities. However, the mood in the economy has also been affected by home-grown problems, especially because the reform process is progressing slowly and has been overshadowed by disagreements within the coalition government. The further development of the Iran conflict is unclear, and the upcoming reforms harbor potential for conflict. Even if the Strait of Hormuz will soon become passable again and oil and gas prices will fall, the increase in energy prices will continue to have an impact for some time. And the subdued mood among investors and consumers is likely to cause restraint for the time being. Only government consumer spending and fiscal programs for infrastructure and defense provide impetus. Under these conditions, the German economy is likely to grow by just under 3/4% this year. In 2027, with an end to the Iran war and a more consistent reform policy, real gross domestic product could grow by 1 1/4%.