The horizontal section of the curve corresponds to the AS downturn economy, high unemployment and under-utilization of production capacity. In these circumstances, tax reduction is desirable because it leads to an increase in production and employment without increasing the overall level of prices.
A vertical segment of the AS curve occurs when the economy is operating at full capacity and it is no longer possible to achieve further growth in production in a short time. An increase in aggregate demand due to a reduction in taxes under these conditions will lead to an increase in the general price level. And the increased prices do not tend to decrease in the short term and will remain at the same level.
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