With such a case where we find a large influx of immigrants and a major new discovery of oil, as well as technological advances in electricity production we would expect the price level to decrease and real GDP to move up in the long run equilibrium.
When prices have fully matched production costs and the economy is operating at its maximum capacity, a market is said to be in long-term equilibrium. Unemployment declines to its natural level in long-run equilibrium.
When this happens, an economy is operating at full capacity, and its actual GDP is equal to its potential GDP. In order to respond to long-term or permanent changes, firms must gradually modify their prices and wages (e.g., taxes, changes to health care costs, government spending).
Since aggregate supply and demand are always fluctuating, an economy's actual GDP frequently differs from its potential GDP. As a result, rather than always being equal to potential GDP, short-run equilibrium is more likely to fluctuate around it.
The output gap, which is the difference between the actual and potential GDP, causes short-run equilibrium to change to long-run as it narrows.
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