14,923 research outputs found
Emissions Taxes and Abatement Regulation Under Uncertainty
We consider environmental regulation in a context where firms invest in abatement technology under conditions of uncertainty about subsequent abatement cost, but can subsequently adjust output in the light of true marginal abatement cost. Where an emissions tax is the only available instrument, policy faces a trade-off between the incentive to invest in abatement technology and efficiency in subsequent output decisions. More efficient outcomes can be achieved by supplementing the emissions tax with direct regulation of abatement technology, or by combining the tax with an abatement technology investment subsidy. We compare the properties of these alternative instrument combinations
Externality-correcting taxes and regulation
Much of the literature on externalities has considered taxes and direct regulation as alternative policy instruments. Both instruments may in practice be imperfect, reflecting informational deficiencies and other limitations. We analyse the use of taxes and regulation in combination, to control externalities arising from individual consumption behaviour. We consider cases where taxes are either imperfectly differentiated to reflect individual differences in externalities, or where some consumption escapes taxation. In both cases we characterise the optimal instrument mix, and show how changing the level of direct regulation alters the optimal externality tax
Self-adjoint difference operators and classical solutions to the Stieltjes--Wigert moment problem
The Stieltjes-Wigert polynomials, which correspond to an indeterminate moment
problem on the positive half-line, are eigenfunctions of a second order
q-difference operator. We consider the orthogonality measures for which the
difference operator is symmetric in the corresponding weighted -spaces.
These measures are exactly the solutions to the q-Pearson equation.In the case
of discrete and absolutely continuous measures the difference operator is
essentially self-adjoint, and the corresponding spectral decomposition is given
explicitly. In particular, we find an orthogonal set of q-Bessel functions
complementing the Stieltjes-Wigert polynomials to an orthogonal basis for
when is a discrete orthogonality measure solving the q-Pearson
equation. To obtain the spectral decomposition of the difference operator in
case of an absolutely continuous orthogonality measure we use the results from
the discrete case combined with direct integral techniques.Comment: 22 pages; section 2 rewritten, to appear in Journal of Approximation
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