When Digital Infrastructure Becomes Economic Infrastructure

Africa has made substantial progress in connectivity, but the development challenge has moved beyond extending networks. The World Bank's Digital Economy for Africa approach combines connectivity with digital platforms, skills, regulatory reform and productive use because the economic return depends on how these layers work together.

Connectivity is therefore a foundation, not the final outcome.

TAY uses a five-step investment chain:

Connectivity -> Interoperability -> Services -> Adoption -> Productivity.

If connectivity is available but services are unaffordable, the chain breaks. If services exist but systems cannot exchange trusted information, it breaks again. If firms cannot adopt the services because of skills, financing or market barriers, infrastructure utilisation remains below potential.

THE INFRASTRUCTURE STACK

TAY distinguishes four layers:

Physical connectivity — fibre, mobile networks, towers, spectrum, submarine cables, data centres, cloud and resilient power.

Digital public infrastructure — identity, payments, trusted data exchange, authentication and other reusable digital building blocks.

Commercial and sector platforms — systems that allow firms and institutions to transact, distribute services, manage supply chains and reach customers.

Productive use — actual adoption by firms, households and governments to improve output, market access, service delivery and investment.

The World Bank's digital public infrastructure framework similarly treats reusable digital building blocks as foundational infrastructure and emphasises interoperability, inclusion, privacy, security and governance.

WHEN A NETWORK BECOMES AN ECONOMIC ASSET

The relevant investment questions are:

• Which economic activities depend on the infrastructure?
• Who can access it, at what price and with what reliability?
• What complementary infrastructure is required?
• Can businesses build services on top of it?
• Can public institutions use the resulting systems?
• Can data move securely between relevant platforms?
• Who bears resilience, maintenance and renewal costs?

These questions move the assessment from asset installation to economic utilisation.

NETWORK EFFECTS AND COMPLEMENTARITY

Digital infrastructure has strong network effects. Recent World Bank infrastructure research finds that digital infrastructure produces higher returns where complementary systems are already in place, and that coordinated investment across infrastructure sectors can outperform isolated investment.

A fibre project can become more valuable when paired with reliable electricity, open-access arrangements, data centres and enterprise demand. A digital identity system becomes more valuable when banks, government agencies and service providers can use it. A regional data-exchange platform becomes more valuable when neighbouring jurisdictions harmonise rules and institutions.

The strongest opportunities may therefore sit at the interfaces between infrastructure categories.

THE REGIONAL DIMENSION

Digital infrastructure is increasingly part of regional economic integration.

Cross-border commerce requires digital payments, trusted identity, data exchange, customs systems, logistics visibility and interoperable regulation in addition to physical border infrastructure. Regional digital infrastructure can therefore increase the value of transport and trade corridors by reducing information and transaction frictions.

The OECD's 2025 assessment estimates that Africa requires about $36 billion in annual digital-infrastructure investment for productive-transformation benchmarks, while highlighting affordability, localised services and underserved populations as remaining constraints.

THE CAPITAL QUESTION

Digital infrastructure can require different forms of capital depending on which layer is being financed.

Long-life physical assets may support infrastructure or project-finance structures where demand, regulation and access arrangements are predictable. Platforms and services may require growth capital. Digital public infrastructure may require public or development finance because benefits can extend beyond direct commercial revenue.

The first test remains additionality: what constraint prevents the economically valuable system from being built or adopted, and what intervention can actually remove it?

THE PRODUCTIVITY TEST

TAY's central test is not whether a digital project is technologically advanced. It is whether the project expands productive capacity.

Evidence can include:

Enterprise productivity — lower transaction costs, faster processing, broader market access or higher output per worker.

Market integration — more firms participating in regional or global markets.

Financial access — lower-cost payments, stronger identity and data systems, or improved access to finance.

Public-service productivity — faster, more reliable and less costly government services.

Innovation capacity — new firms and services building on reusable infrastructure.

Resilience — continuity of economic and public services during disruption.

INVESTMENT IMPLICATION

A strong digital-infrastructure assessment connects five questions:

1. Asset — What is actually being built?
2. Access — Who can use it, at what quality and price?
3. Interoperability — What systems can connect to it?
4. Adoption — Which firms, institutions and households will use it?
5. Outcome — What measurable economic capability changes?

If the assessment stops at the first question, it is incomplete.

Digital infrastructure is not economically transformational because it is digital.

It becomes transformational when it is embedded in the systems through which an economy produces, trades, finances, governs and innovates.

For TAY, the relevant unit of analysis is therefore not the data centre, fibre route, tower network or platform alone.

It is the economic system that becomes possible because the infrastructure exists.

WHAT TO WATCH

1. Affordable and reliable access rather than headline coverage.
2. Interoperability between public, financial and commercial systems.
3. Enterprise adoption and evidence of productive use.
4. Complementary power, transport, data, skills and regulatory infrastructure.
5. Regional compatibility where infrastructure supports cross-border markets.
6. Resilience, cybersecurity, privacy and governance.

Digital infrastructure can produce weak returns when demand is overstated, regulation is unstable, markets are concentrated, complementary systems are absent or adoption is slower than expected.

The correct conclusion is not that more digital infrastructure is always better.

It is that better-connected productive systems can be more valuable than better-connected networks.

That distinction is central to TAY's assessment of digital infrastructure, technology-enabled development and regional economic transformation.

Demand may be overstated; regulation, affordability, market concentration, complementary infrastructure, cybersecurity or adoption constraints can weaken economic returns.