Lets me ask you one question since you jump the most when you say china economy is 6 trillion..what does it exactly mean ????
does china have 6 trillion $ in pocket or is the worthiness of all asset in china .....
now what happens to that number when those asset prices like say real estate since it makes a large chunk of your economy starts falling.....does your economy size shrink or its remain as it is ..?????????
Cost of cement, steel, and the construction wages are booked as industry GDP. Wages from real estate industry and its profit are booked as service GDP.
Revenue generated from land sell, or investment gain from reselling are not accounted into GDP.
So yeah, the GDP from real estate are it's input cost, actual price of commercial housing are a lot higher than it's input cost. Besides, cars and iPad are constantly being eroded and food are simply consumed, a dollar of GDP is still a dollar of GDP regardless of what happened to the product after.