是的，这个问题很重要，我认为，发达国家的ＦＤＩ的动机一般倾向于中国的市场潜力和劳动力成本，日本的ＦＤＩ倾向于将中国作为出口基地和服务于全球网络，但近年来，中国市场的潜力成为各国ＦＤＩ投资的重要动机。

国市场的潜力能用什么指标表示呢？

东道国制度的因素好多文献 啊，去找找。
  Data on institutions：
         TheInstitutional Profiles (IP) database : In 2001, the French Ministry of Finance conducted
a detailed survey on institutions through its foreign network in 52 countries (the database
is described in detail in Berthelier et al., 2003). A total of 330 elementary questions
were asked concerning public institutions, capital markets, goods markets and labor markets.
In each case, a set of questions were asked covering political institutions, public order,
public governance, market freedom, investment on future, ability to reform, security
of transactions and contracts, regulation, openness, and social cohesion. Each question
was itself decomposed into elementary, objective items ranked 0 or 1 (weak institutions)
to 4 (good institutions).
    TheFraser Institute database : Since 1986, the Fraser Institute has constructed indices of
economic freedom based on three key notions : Individual choice and voluntary transaction,
free competition, personal and property protection. These notions are then detailed
along several aspects of the economy, using miscellaneous sources such as the World
Economic Forum Global Competitiveness Report, the PRS Group International Country
Risk Guide, or even more classical sources such as the IMF International Financial
Statistics. Our motivation for using this database is principally based on its temporal dimension.
We use the Fraser database to introduce a time dimension (1985, 1990, 1995,
2000) for some items which are shown to matter in the regressions performed with the
IP database.
– The KKZL database : the Kaufmann, Kraay and Zoidon-Lobatón (KKZL) database is
widely used in the empirical literature on the impact of institutions on FDI. This database
deals with public governance in 178 countries. It compiles data from 13 different
organizations. The large country coverage is allowed by the fact that the indicators are
estimated rather than directly observed. Another issue with this governance effectiveness
index is that it is available for the year 1998 only.
– World Development Indicators (World Bank) : This database covers 154 countries and all
years for which we have data on FDI stocks. We use market capitalization (% of GDP),
the share of children aged 10-14 in the labor force, and the R&D expenses as a share of
GDP as additional institutional variables.

市场潜力的研究在cepii研究中心的系列论文中有，有市场潜力和贸易潜力。2005和 2009各有文章

关键是FDI的流入很难区分，也很难统计，所以写的人就很少了