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.
Grout the Tile. Then you want to come back and grout the tile, and then after you grout it, you need to wait 24 to 48 hours before that's cured. Then you come back and seal the grout. You probably want to wait 48 hours before you have any foot traffic on that.