Step 1: A single continuum:
Centralisation and decentralisation are best understood as two ends of a single spectrum of authority distribution, not as an absolute either/or choice — every organisation is decentralised to some extent and centralised to some extent simultaneously.
Step 2: Where each end excels:
Full centralisation offers tight, uniform control ideal for maintaining consistent quality or brand standards; full decentralisation offers flexibility and local responsiveness ideal where markets or conditions differ significantly by location.
Step 3: Practical difference in accountability:
Under centralisation, accountability for most decisions stays clearly with top management; under decentralisation, accountability is shared with — and partly rests on — the lower-level managers who now hold real decision-making power.
Step 4: Balancing the two:
Most real organisations choose a balanced position — centralising decisions that need company-wide consistency (like overall strategy) while decentralising operational decisions (like local purchasing) that benefit from being close to the ground.
Final Answer:
Centralisation and decentralisation sit on a single spectrum of authority distribution; the key differences lie in where decisions are made, how quickly, who bears the workload, and how much managerial development occurs at lower levels.