正如下面的图表显示，过去几年，它们的价格都是同步上涨和下跌的。

As the chart below shows, their prices have risen and fallen in step in recent years.

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但是象股票那样(不同于债券)，投资者可以预期收益上涨，至少能与通胀同步。

But like shares (and unlike bonds), investors can expect that income to grow, at least in line with inflation.

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同步指数上个月上涨0.2%，九月份经修正后为持平。

The coincident index was up 0.2% last month, after a revised unchanged reading in September.

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