When one looks just five years ahead it might be tempting to argue that there is not much scope for significant change in Irish agriculture in that time frame. However, the relatively recent history of Irish agriculture shows that it is possible to see remarkable shifts in such time periods. For example, between 1987 and 1992 the suckler herd grew from under 500,000 to around 900,000 cows and between 1984 and 1989 ewe numbers doubled from two to four million. Of course, these changes were driven more by policy than markets and the policy landscape has changed considerably since then.More generally, a complex interaction of policy, markets, economic forces, physical factors and technology determine the pattern of land use and agricultural output in Ireland (see Figure 1). Within this, economic theory would suggest that farmers will adopt the system that provides the greatest level of profit.