The licence for a wheelchair-accessible taxi now costs £15,000, compared with £100 in 1992.
The taxi-licence renewal fee has gone up from £7 to £450 over the same period.
The fare rate has risen only 5p a mile since 1985, to the present 80p level.
The Dublin taxi-meter area has been rearranged without consultation with drivers.
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Devolution of responsibility for the taxi service from the Department of the Environment to the four Dublin local authorities is proving "unworkable", say drivers.