Authored by Constantin Gurdgiev via True Economics blog,

Here is the most important chart I have seen in some months now. The chart shows the 'new normal' post-2007 crisis in terms of per capita real GDP for the U.S.

Source: http://rooseveltinstitute.org/wp-content/uploads/2017/07/Monetary-Policy-Report-070617-2.pdf

The key matters highlighted by this chart are:

The Great Recession was unprecedented in terms of severity of its impact and duration of that impact for any period since 1947. The Great Recession is the only period in the U.S. modern history when the long term (trend) path of real GDP per capita shifted permanently below historical trend. The Great Recession is the only period in the U.S. modern history when the long term trend growth in GDP per capita substantially and permanently fell below historical trend.

As the result, as the Roosevelt Institute research note states, " output remains a full 15 percent below the pre-2007 trend line, a gap that is getting wider, not narrower, over time".

The dramatic nature of the current output trend (post-2007) departure from the past historical trend is highlighted by the fact that pre-crisis models for forecasting growth have produced massive misses compared to actual outrun and that over time, as new trend establishes more firmly in the data, the models are slowly catching up with the reality:

Source: ibid

Finally, confirming the thesis of secular stagnation (supply side), the research note presents evidence on structural decline in labor productivity growth, alongside the evidence that this decline is inconsistent with pre-2007 trends:

On the net, the effects of the Great Recession in terms of potential output, actual output growth trends, labor productivity and wages appear to be permanent in nature.