Autonomous investment is indicated by the intercept. 1  An Induced Slope: The slope of the investment equation (f) measures the change in investment resulting from a change in income. If income changes by $1, then investment changes by $f.
24 to 48 Hours. You should wait at least 24 hours before grouting the tiles. You may notice that the edges of the thinset or the thinset showing through the grout lines looks dry. Don't be fooled by this. The thinset under the tiles isn't receiving as much air as the edges and is therefor not fully cured.
The initial setting time is around 2 hours. But I wouldnât step on concrete before around 7 to 10 hours so I would leave no markings. Most slabs are good for foot traffic the next day, without leaving scuff marks. Wait until the first test cylinder break (3 days) before wheeled traffic.