All models imply a set of unknown factors or constants.

Such a model also implies a change in the driving force of economic decision-making.

The model therefore implies that the deviations of output from its natural rate should also be unpredictable and exhibit no pattern.

This model implies that the users later on in time will take longer to accelerate as they meet each of the lines.

For instance, porter's model implies that national infrastructure and other factors determine national performance.

Secondly, the model implies that curriculum planning is always to some extent a contingent matter, in which there will be few across-the-board answers.

The model implies that communication should focus on improving the transfer of information from experts to non-experts.

Physical models in 1973 implied that Drake's creatures would be microscopic.

Surfaces often change their form away from the simple "cleaved bond" model just implied above.

However as these models imply, they are old galaxies having formed most of their stellar mass several billion (gigayear) ago.