To help you understand what's going on in business and the economy and what we expect to happen in the future, our highly experienced Kiplinger Letter team will keep you abreast of the latest developments and forecasts ( Get a free issue of The Kiplinger Letter or subscribe ). You'll get all the latest news first by subscribing, but we will publish many (but not all) of the forecasts a few days afterward online. Here’s the latest… Another commodity facing Iran war fallout: Industrial metals. The Middle East conflict has disrupted supplies, increased production costs and created another headache for U.S. manufacturers already dealing with the effects of higher tariffs . Aluminum has taken the greatest hit. Prices have jumped dramatically since the war began, damaging regional smelters and curtailing shipments from the Persian Gulf, where six countries account for a fifth of U.S. aluminum imports. The metal’s cost in the U.S.…