Regional Growth Linkages between Villages and Towns in Mexico: A Village-wide Modeling Perspective

This paper measures linkages between farm and non-farm activities in rural Mexico using a multiplier model based on social accounting matrices (SAMs) from survey data for five villages at differing income levels and in different agro-ecological and market zones. We extend this analysis to a "mini-region" that includes three villages and their larger administrative center. By applying a constrained SAM multiplier model, the paper examines how economic shocks in rural areas affect non-farm incomes in rural villages, in neighboring rural towns and in larger regional cities. Two exogenous shocks on non-farm activity are examined: pure income transfers; and increased agricultural productivity. Experiments assume a perfectly inelastic supply of agricultural goods, as in "semi inputoutput" and "economic base" models. Results show that most farm-nonfarm diversification is between villages and regional urban centers. The largest linkages are with markets outside, rather than within, villages: an experimental $100 increase in exogenous income is linked with a$2 increase in non-farm production but a $51 increase in demand for imported goods. This is evidence of "agriculture-demand-ledindustrialization" and explains growth of regional urban centers, which now accounts for most of Mexico's urban growth. Our analysis highlights the complex economic interactions between villages and towns in what probably is a mutually beneficial relationship broadly consistent with comparative advantage. Results suggest that increasing the income of village households can stimulate growth of the rural non-farm commercial activity in towns and small cities. Comparisons across villages suggest that investments in rural infrastructure can facilitate these commercial linkages between villages and towns.Rural and Regional Economics, Development Economics, Community/Rural/Urban Development,

Finishing the euchromatic sequence of the human genome

The sequence of the human genome encodes the genetic instructions for human physiology, as well as rich information about human evolution. In 2001, the International Human Genome Sequencing Consortium reported a draft sequence of the euchromatic portion of the human genome. Since then, the international collaboration has worked to convert this draft into a genome sequence with high accuracy and nearly complete coverage. Here, we report the result of this finishing process. The current genome sequence (Build 35) contains 2.85 billion nucleotides interrupted by only 341 gaps. It covers ∼99% of the euchromatic genome and is accurate to an error rate of ∼1 event per 100,000 bases. Many of the remaining euchromatic gaps are associated with segmental duplications and will require focused work with new methods. The near-complete sequence, the first for a vertebrate, greatly improves the precision of biological analyses of the human genome including studies of gene number, birth and death. Notably, the human enome seems to encode only 20,000-25,000 protein-coding genes. The genome sequence reported here should serve as a firm foundation for biomedical research in the decades ahead

Regional Growth Linkages between Villages and Towns in Mexico: A Village-wide Modeling Perspective

This paper measures linkages between farm and non-farm activities in rural Mexico using a multiplier model based on social accounting matrices (SAMs) from survey data for five villages at differing income levels and in different agro-ecological and market zones. We extend this analysis to a "mini-region" that includes three villages and their larger administrative center. By applying a constrained SAM multiplier model, the paper examines how economic shocks in rural areas affect non-farm incomes in rural villages, in neighboring rural towns and in larger regional cities. Two exogenous shocks on non-farm activity are examined: pure income transfers; and increased agricultural productivity. Experiments assume a perfectly inelastic supply of agricultural goods, as in "semi inputoutput" and "economic base" models. Results show that most farm-nonfarm diversification is between villages and regional urban centers. The largest linkages are with markets outside, rather than within, villages: an experimental $100 increase in exogenous income is linked with a$2 increase in non-farm production but a $51 increase in demand for imported goods. This is evidence of "agriculture-demand-ledindustrialization" and explains growth of regional urban centers, which now accounts for most of Mexico's urban growth. Our analysis highlights the complex economic interactions between villages and towns in what probably is a mutually beneficial relationship broadly consistent with comparative advantage. Results suggest that increasing the income of village households can stimulate growth of the rural non-farm commercial activity in towns and small cities. Comparisons across villages suggest that investments in rural infrastructure can facilitate these commercial linkages between villages and towns