The OECD’s twin-transition framework treats digitalisation and green compliance as reinforcing investments. Adopt one, the logic runs, and the other gets cheaper: digital tools cut the cost of environmental reporting, and energy efficiency frees capital for technology. The OECD’s January 2026 report on EU retail SMEs tests this premise against a decade of data and finds it wanting. Retail SMEs have lost market share to larger firms throughout the period, and the twin mandates now ask those same firms to fund two capital-intensive transitions simultaneously, each with hard deadlines and uncertain returns.

Market concentration sets the stage. Retail SMEs’ share of revenue, value added, and employment has fallen steadily over the past decade, even as their output grew in absolute terms. Large enterprises represent 0.1 per cent of retail businesses yet account for around half of total revenue, a ratio built on structural advantages in procurement, logistics, and digital infrastructure. Each new regulatory obligation compounds that advantage, because compliance costs scale sublinearly with firm size. The fixed cost of an energy audit or a CRM integration is roughly the same for a chain of five hundred stores and a shop of five; only one of them can amortise it across revenue.

The digital divide is where the framework’s optimism unravels first. Eurostat’s 2024 survey found that 48 per cent of large EU enterprises conduct e-sales, against 21 per cent of small enterprises. That gap measures only participation. In capability, the distance is wider still: advanced tools such as cloud computing, AI, and customer-relationship management remain overwhelmingly the province of large firms, with uptake “uneven across countries and firm sizes,” the OECD notes. For a ten-person clothing shop, the capital required to close that distance is the same capital the policy framework expects will fund green compliance.

Green compliance adds a second capital demand on nearly the same timeline. The revised Energy Performance of Buildings Directive entered force in May 2024; the directive sets a transposition deadline of May 2026 and requires member states to renovate the 16 per cent worst-performing non-residential buildings by 2030. Retail stores fall squarely within that scope. The European Investment Bank found that SMEs invest in energy efficiency at half the rate of larger companies — a shortfall large enough to prompt a €17.5 billion financing initiative for 2025–2027. The EPBD deadline does not wait for those funds to arrive.

The skills deficit makes the squeeze three-dimensional. The OECD’s companion paper on twin-transition skills found that policy support for digital upskilling is growing across member states, but green skills programmes lag well behind. A retailer that needs both a web developer and an energy auditor is competing for both in the same tight labour market, with the same thin budget. Around half of European consumers consider health and environmental factors in their purchasing decisions — a figure the OECD draws from McKinsey’s 2024 research. That demand exists, but SMEs cannot capture it without the digital infrastructure to prove provenance, track emissions, and communicate credentials.

Neither transition generates the returns needed to fund the other within the timeframe the regulations demand.

The timing problem is structural, not circumstantial. Digital investment in retail typically generates returns only at a threshold of integration: CRM, inventory, e-commerce, and analytics working as a system rather than as isolated modules. Most SMEs have not reached that threshold. Eurostat reports that only 58 per cent of EU SMEs achieved even a basic level of digital intensity in 2023, with most clustering in the lowest tiers. A shop still building its first website cannot extract enough digital ROI to fund a building retrofit due by 2030. Green compliance, meanwhile, is a cost centre for most small retailers: it will reduce energy bills over years, but the upfront capital competes directly with the digital spend the policy framework assumes is already in place.

The strongest objection is the synergy thesis itself. The Joint Research Centre’s 2024 review documents evidence of digitalisation’s potential to improve efficiency and production coordination — the mechanism by which twin-transition adoption could reduce the cost of green compliance. If an SME adopts both transitions simultaneously, the digital infrastructure pays for itself partly through energy savings. The condition for this to hold is that the firm already possesses the capital, skills, and management bandwidth to execute a coordinated twin programme. The OECD’s data suggests most do not: digital intensity is low, green skills policy is underdeveloped, and the market share these firms need to sustain investment is eroding. The synergy is real in theory and inaccessible in practice for the firms most exposed to the mandates.

Brussels has begun to notice the strain. The Omnibus I Directive, entering force in March 2026, raised the CSRD sustainability reporting threshold to firms with more than 1,000 employees, exempting the majority of previously scoped companies. But the EPBD renovation mandates remain untouched, and large retailers subject to CSRD will still demand sustainability data from SME suppliers, shifting the reporting burden downward without shifting the budget. The twin transition, as policy, assumes firms can sequence two expensive bets on a single balance sheet. If the mandates proceed on their current schedule, the framework’s most consequential output will be the market consolidation it was designed to prevent.