First, the trade deficit as a share of GDP is shrinking…as long as one excludes oil.
Presumably, the total deficit will decline as oil prices fall. That is, as long as exports continue to grow sufficiently rapidly.
Second, what matters to GDP growth is the trends in real exports and real imports.
Figure 2: Log real goods exports (blue), log real goods imports (red) and log real goods imports ex.-oil (green). Source: BEA/Census.
Real (goods) imports do continue to shrink, both including and excluding oil. On the other hand, real exports — while above 2003-08 trend — are no longer growing. Of course, it could be that export growth will resume (and in addition recall here that service exports are not included). The IMF’s prognosis for Europe and to a lesser extent the emerging markets does not provide much basis for believing in a resurgence in real export growth such as has occurred in the past year and half , .
Finally, note that import and export prices are falling into September. In particular, the sharp decline in both goods and goods ex-oil import prices will mean less inflationary pressure being imported from abroad (if people were still worrying about that).
Figure 3: Log price index for goods exports (black), goods exports ex.-agricultural commodities (green), goods imports (red) and goods imports ex.-oil (blue). Source: BLS.
Furthermore, the net barter terms of trade (the ratio of export to import prices) has sharply reversed course, a phenomenon primarily driven by declining oil prices.
Figure 4: Ratio of price index for goods exports to goods imports (blue, left axis), goods exports ex.-agricultural commodities to goods imports ex.-oil (red, right axis). Source: BLS and author’s calculations.
This is good news, in so far as it means that each unit of exports gets more units of imports. (The deterioration is continuing if one measures import prices excluding oil.)