Below is the graph of a quadratic function, showing where the function is increasing and decreasing. If we draw in the tangents to the curve, you will notice that if the gradient of the tangent is ...

This is a preview. Log in through your library . Journal Information The Review of Economics and Statistics is an 84-year old general journal of applied (especially quantitative) economics. Edited at ...

This is a preview. Log in through your library . Abstract Nitrogen (N) losses from intensified agriculture are a major cause of global change, due to nitrate (NO₃⁻) export and the eutrophication of ...