This paper reflects critically on challenges and opportunities associated with developing a theoretical framework for an interdisciplinary Framework Programme 7 research project funded by the European Commission in the area of digital ecosystems. The paper first provides a description of the interdisciplinary structure of the research agenda of the project and the areas of digital ecosystem research prioritised by each discipline. Second, it discusses the challenging questions of epistemology that arose in the context of theorising interdisciplinary research and provides a summary of how these were dealt with in order to outline a theoretical framework for digital ecosystems research by the end of the project. Finally, it discusses the lessons that can be extrapolated from the project experience, arguing that it is impossible to develop a unified interdisciplinary theoretical framework due to irreconcilable epistemological differences, yet it is possible and very worthwhile for those adhering to various disciplinary perspectives to collaborate towards the achievement of a practical joint endeavour. These lessons, which are considered valuable to the broader research community, are summarised in a model of the (im)possibility of interdisciplinarity.

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During financial crises, liquidity tends to become scarce, a problem that disproportionately affects small companies. This paper shows that obligation-clearing is a very effective liquidity-saving method for providing relief in the trade credit market and, therefore, on the supply-side or productive part of the economy. The paper also demonstrates that when used in conjunction with a complementary currency system such as mutual credit as a liquidity source the effectiveness of obligation-clearing can be doubled. Real data from the Sardex mutual credit system show a reduction of net internal debt of the obligation network of approximately 25% when obligation-clearing is used by itself and of 50% when it is used together with mutual credit. These instruments are also relevant from the point of view of risk mitigation for lenders, based in part on the information on individual companies that the mutual credit circuit manager can provide to banks (upon the circuit member’s request) and in part on the relief that liquidity-saving provides especially to NPL companies. The paper concludes by outlining recommendations for how even greater savings could be achieved by including the tax authority as another node in the obligation network.

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