David Ricardo

In comparing therefore the value of the same commodity, at different periods of time, the consideration of the comparative skill and intensity of labour, required for that particular commodity, needs scarcely to be attended to, as it operates equally at both periods.

During the period of capital moving from one employment to another, the profits on that to which capital is flowing will be relatively high, but will continue so no longer than till the requisite capital is obtained.

The Yas Marina circuit is really pretty impressive. The track itself has some quite slow corners and not a great deal of overtaking opportunities, but it seems to combine a road course with a circuit course.